update libxml2

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-124907 HTML parse buffer problem when parsing larse in-memory docs
-124110 DTD validation && wrong namespace
-123564 xmllint --html --format
-
-           TODO for the XML parser and stuff:
-	   ==================================
-
-      $Id$
-
-    this tend to be outdated :-\ ...
-
-DOCS:
-=====
-
-- use case of using XInclude to load for example a description.
-  order document + product base -(XSLT)-> quote with XIncludes 
-                                                   |
-  HTML output with description of parts <---(XSLT)--
-
-TODO:
-=====
-- XInclude at the SAX level (libSRVG)
-- fix the C code prototype to bring back doc/libxml-undocumented.txt
-  to a reasonable level
-- Computation of base when HTTP redirect occurs, might affect HTTP
-  interfaces.
-- Computation of base in XInclude. Relativization of URIs.
-- listing all attributes in a node.
-- Better checking of external parsed entities TAG 1234
-- Go through erratas and do the cleanup.
-  http://www.w3.org/XML/xml-19980210-errata ... started ...
-- jamesh suggestion: SAX like functions to save a document ie. call a
-  function to open a new element with given attributes, write character
-  data, close last element, etc
-  + inversted SAX, initial patch in April 2002 archives.
-- htmlParseDoc has parameter encoding which is not used.
-  Function htmlCreateDocParserCtxt ignore it.
-- fix realloc() usage.
-- Stricten the UTF8 conformance (Martin Duerst):
-  http://www.w3.org/2001/06/utf-8-test/.
-  The bad files are in http://www.w3.org/2001/06/utf-8-wrong/.
-- xml:id normalized value
-
-TODO:
-=====
-
-- move all string manipulation functions (xmlStrdup, xmlStrlen, etc.) to
-  global.c. Bjorn noted that the following files depends on parser.o solely
-  because of these string functions: entities.o, global.o, hash.o, tree.o,
-  xmlIO.o, and xpath.o.
-
-- Optimization of tag strings allocation ?
-
-- maintain coherency of namespace when doing cut'n paste operations
-  => the functions are coded, but need testing
-
-- function to rebuild the ID table
-- functions to rebuild the DTD hash tables (after DTD changes).
-   
-
-EXTENSIONS:
-===========
-
-- Tools to produce man pages from the SGML docs.
-
-- Add Xpointer recognition/API
-
-- Add Xlink recognition/API
-  => started adding an xlink.[ch] with a unified API for XML and HTML.
-     it's crap :-(
-
-- Implement XSchemas
-  => Really need to be done <grin/>
-  - datatype are complete, but structure support is very limited.
-
-- extend the shell with:
-   - edit
-   - load/save
-   - mv (yum, yum, but it's harder because directories are ordered in
-     our case, mvup and mvdown would be required)
-
-
-Done:
-=====
-
-- Add HTML validation using the XHTML DTD
-  - problem: do we want to keep and maintain the code for handling
-    DTD/System ID cache directly in libxml ?
-  => not really done that way, but there are new APIs to check elements
-     or attributes. Otherwise XHTML validation directly ...
-
-- XML Schemas datatypes except Base64 and BinHex
-
-- Relax NG validation
-
-- XmlTextReader streaming API + validation
-
-- Add a DTD cache prefilled with xhtml DTDs and entities and a program to
-  manage them -> like the /usr/bin/install-catalog from SGML
-  right place seems $datadir/xmldtds
-  Maybe this is better left to user apps
-  => use a catalog instead , and xhtml1-dtd package
-
-- Add output to XHTML
-  => XML serializer automatically recognize the DTd and apply the specific
-     rules.
-
-- Fix output of <tst val="x&#xA;y"/>
-
-- compliance to XML-Namespace checking, see section 6 of
-  http://www.w3.org/TR/REC-xml-names/
-
-- Correct standalone checking/emitting (hard)
-  2.9 Standalone Document Declaration
-
-- Implement OASIS XML Catalog support
-  http://www.oasis-open.org/committees/entity/
-
-- Get OASIS testsuite to a more friendly result, check all the results
-  once stable. the check-xml-test-suite.py script does this
-
-- Implement XSLT
-  => libxslt
-
-- Finish XPath
-  => attributes addressing troubles
-  => defaulted attributes handling
-  => namespace axis ?
-  done as XSLT got debugged
-
-- bug reported by Michael Meallin on validation problems
-  => Actually means I need to add support (and warn) for non-deterministic
-     content model.
-- Handle undefined namespaces in entity contents better ... at least
-  issue a warning
-- DOM needs
-  int xmlPruneProp(xmlNodePtr node, xmlAtttrPtr attr);
-  => done it's actually xmlRemoveProp xmlUnsetProp xmlUnsetNsProp
-
-- HTML: handling of Script and style data elements, need special code in
-  the parser and saving functions (handling of < > " ' ...):
-  http://www.w3.org/TR/html4/types.html#type-script
-  Attributes are no problems since entities are accepted.
-- DOM needs
-  xmlAttrPtr xmlNewDocProp(xmlDocPtr doc, const xmlChar *name, const xmlChar *value)
-- problem when parsing hrefs with & with the HTML parser (IRC ac)
-- If the internal encoding is not UTF8 saving to a given encoding doesn't
-  work => fix to force UTF8 encoding ...
-  done, added documentation too
-- Add an ASCII I/O encoder (asciiToUTF8 and UTF8Toascii)
-- Issue warning when using non-absolute namespaces URI.
-- the html parser should add <head> and <body> if they don't exist
-  started, not finished.
-  Done, the automatic closing is added and 3 testcases were inserted
-- Command to force the parser to stop parsing and ignore the rest of the file.
-  xmlStopParser() should allow this, mostly untested
-- support for HTML empty attributes like <hr noshade>
-- plugged iconv() in for support of a large set of encodings.
-- xmlSwitchToEncoding() rewrite done
-- URI checkings (no fragments) rfc2396.txt
-- Added a clean mechanism for overload or added input methods:
-  xmlRegisterInputCallbacks()
-- dynamically adapt the alloc entry point to use g_alloc()/g_free()
-  if the programmer wants it: 
-    - use xmlMemSetup() to reset the routines used.
-- Check attribute normalization especially xmlGetProp()
-- Validity checking problems for NOTATIONS attributes
-- Validity checking problems for ENTITY ENTITIES attributes
-- Parsing of a well balanced chunk xmlParseBalancedChunkMemory()
-- URI module: validation, base, etc ... see uri.[ch]
-- turn tester into a generic program xmllint installed with libxml
-- extend validity checks to go through entities content instead of
-  just labelling them PCDATA
-- Save Dtds using the children list instead of dumping the tables,
-  order is preserved as well as comments and PIs
-- Wrote a notice of changes requires to go from 1.x to 2.x
-- make sure that all SAX callbacks are disabled if a WF error is detected
-- checking/handling of newline normalization
-  http://localhost/www.xml.com/axml/target.html#sec-line-ends
-- correct checking of '&' '%' on entities content.
-- checking of PE/Nesting on entities declaration
-- checking/handling of xml:space
-   - checking done.
-   - handling done, not well tested
-- Language identification code, productions [33] to [38]
-  => done, the check has been added and report WFness errors
-- Conditional sections in DTDs [61] to [65]
-  => should this crap be really implemented ???
-  => Yep OASIS testsuite uses them
-- Allow parsed entities defined in the internal subset to override
-  the ones defined in the external subset (DtD customization).
-  => This mean that the entity content should be computed only at
-     use time, i.e. keep the orig string only at parse time and expand
-     only when referenced from the external subset :-(
-     Needed for complete use of most DTD from Eve Maler
-- Add regression tests for all WFC errors
-  => did some in test/WFC
-  => added OASIS testsuite routines
-     http://xmlsoft.org/conf/result.html
-
-- I18N: http://wap.trondheim.com/vaer/index.phtml is not XML and accepted
-  by the XML parser, UTF-8 should be checked when there is no "encoding"
-  declared !
-- Support for UTF-8 and UTF-16 encoding
-  => added some convertion routines provided by Martin Durst
-     patched them, got fixes from @@@
-     I plan to keep everything internally as UTF-8 (or ISO-Latin-X)
-     this is slightly more costly but more compact, and recent processors
-     efficiency is cache related. The key for good performances is keeping
-     the data set small, so will I.
-  => the new progressive reading routines call the detection code
-     is enabled, tested the ISO->UTF-8 stuff
-- External entities loading: 
-   - allow override by client code
-   - make sure it is alled for all external entities referenced
-  Done, client code should use xmlSetExternalEntityLoader() to set
-  the default loading routine. It will be called each time an external
-  entity entity resolution is triggered.
-- maintain ID coherency when removing/changing attributes
-  The function used to deallocate attributes now check for it being an
-  ID and removes it from the table.
-- push mode parsing i.e. non-blocking state based parser
-  done, both for XML and HTML parsers. Use xmlCreatePushParserCtxt()
-  and xmlParseChunk() and html counterparts.
-  The tester program now has a --push option to select that parser 
-  front-end. Douplicated tests to use both and check results are similar.
-
-- Most of XPath, still see some troubles and occasionnal memleaks.
-- an XML shell, allowing to traverse/manipulate an XML document with
-  a shell like interface, and using XPath for the anming syntax
-  - use of readline and history added when available
-  - the shell interface has been cleanly separated and moved to debugXML.c
-- HTML parser, should be fairly stable now
-- API to search the lang of an attribute
-- Collect IDs at parsing and maintain a table. 
-   PBM: maintain the table coherency
-   PBM: how to detect ID types in absence of DtD !
-- Use it for XPath ID support
-- Add validity checking
-  Should be finished now !
-- Add regression tests with entity substitutions
-
-- External Parsed entities, either XML or external Subset [78] and [79]
-  parsing the xmllang DtD now works, so it should be sufficient for
-  most cases !
-
-- progressive reading. The entity support is a first step toward
-  asbtraction of an input stream. A large part of the context is still
-  located on the stack, moving to a state machine and putting everyting
-  in the parsing context should provide an adequate solution.
-  => Rather than progressive parsing, give more power to the SAX-like
-     interface. Currently the DOM-like representation is built but
-     => it should be possible to define that only as a set of SAX callbacks
-	and remove the tree creation from the parser code.
-	DONE
-
-- DOM support, instead of using a proprietary in memory
-  format for the document representation, the parser should
-  call a DOM API to actually build the resulting document.
-  Then the parser becomes independent of the in-memory
-  representation of the document. Even better using RPC's
-  the parser can actually build the document in another
-  program.
-  => Work started, now the internal representation is by default
-     very near a direct DOM implementation. The DOM glue is implemented
-     as a separate module. See the GNOME gdome module.
-
-- C++ support : John Ehresman <jehresma@dsg.harvard.edu>
-- Updated code to follow more recent specs, added compatibility flag
-- Better error handling, use a dedicated, overridable error
-  handling function.
-- Support for CDATA.
-- Keep track of line numbers for better error reporting.
-- Support for PI (SAX one).
-- Support for Comments (bad, should be in ASAP, they are parsed
-  but not stored), should be configurable.
-- Improve the support of entities on save (+SAX).
-