upgrade tkimg to 1.4.6

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-
-		Tcl/Tk Image formats (TkImg)
-		(Version 1.4 / September 2010)
-
-		Jan Nijtmans, Andreas Kupries, Paul Obermeijer
-
-This file contains a collection of format handlers for the Tk photo
-image type, and a new image type, pixmaps.  It can be used in
-combination with Tcl/Tk 8.3 or later but 8.5.9 (or 8.6, when
-available) are highly recommended.
-
-Included in this distribution are the most recent versions (as of
-sept 2010) of the libz, libpng, libjpeg, and libtiff libraries.
-These are not required, unless you need support for the PNG, JPEG,
-or TIFF format. Note that you have to build these libraries to
-support the named formats, even if your system already has shared
-libraries for these formats. This is because the libraries here are
-built such that they can be loaded as packages by the Tcl/Tk core,
-making the handling of the various dependencies much easier. An
-earlier version, 1.2.4, used a modified copy of Tcl's functions for
-loading of shared libraries to load the support libraries at runtime.
-These have been abandoned in favor of the new approach.
-
-BACKGROUND TO BUILDING
-
-The TkImg sources have been heavily refactored. Instead of building
-one big package there are several small packages most of which are
-independent of each other.
-
-All packages employ a TEA 2 based build system (configure/Make) for
-easy configuration and building. This means that 99% of the options
-to configure are the same for all the packages.
-
-All packages save for the supporting ones (see below) have names
-starting with 'img'. For compatibility with older scripts the
-package index file of the utility package 'img::base' declares
-pseudo-packages 'img' and 'Img' which load all packages provided
-by this extension.
-
-BUILDING - The convenient way
-
-The toplevel directory of tkImg contains a configure and Makefile for
-convenient configuration and building of all packages in the
-extension.
-
-Run this configure script in a build directory of your choice to
-configure all packages, then run
-
-	make all
-	make install
-
-in the build directory. The most important options for configure are
---prefix and --exec-prefix which tell the build system where to find
-Tcl and Tk, and also where to install the results of the builds
-(header, shared libraries, ...).
-
-This convenient build installs all shared libraries in a single
-directory 'Img<VERSION>, together with a union package index for all
-packages.
-
-If the builder requires only a subset of the packages he can use
-
-	make all
-
-to build all packages, but must not use 'make install' in the top
-build directory. Instead run
-
-	make install
-
-in the sub directories of the build directory which contain the
-requested packages, and their dependencies !
-
-PACKAGES AND THEIR DEPENDENCIES
-
-This section is for people who want to bypass the master
-configure/Makefile.
-
-At the bottom of the hierarchy of dependencies are the 'support
-packages'. They encapsulate the support libraries for ZIP, TIFF, PNG
-and JPEG in packages directly loadable by Tcl. They provide the
-functionality of their underlying libraries via stub-tables. The names
-of these packages are:
-
-	Name		Directory		    Dependency
-	-------------------------------------------------
-	zlibtcl		tkimg/compat/libz
-	pngtcl		tkimg/compat/libpng	  zlibtcl
-	jpegtcl		tkimg/compat/libjpeg
-	tifftcl		tkimg/compat/libtiff
-	-------------------------------------------------
-
-The package 'pngtcl' depends on 'zlibtcl' and has to be built after
-it. Beyond that the order of building is free. Their TEA build systems
-can be found in the directories listed above.
-
-The configure/Makefile's in the directories
-
-	tkimg/compat/libz, tkimg/compat/libpng, tkimg/compat/libjpeg, tkimg/compat/libtiff
-
-must _not_ be used directly under any circumstances.
-
-
-At the next level is the package 'tkimg'. It provides utility
-functions used by all format handlers, and therefore has to be built
-before any of them. Its TEA build system can be found in the directory
-
-	Name		Directory		Dependency
-	-------------------------------------------------
-	img::base	tkimg/base
-	-------------------------------------------------
-
-Beyond that are the packages providing the various format
-handlers. They can be built in any order. Some of them depend on
-supporting packages, as noted below. Their names and directories are
-
-	Name		Directory	Dependency
-	-------------------------------------------------
-	img::bmp	tkimg/bmp
-	img::dted	tkimg/dted
-	img::gif	tkimg/gif
-	img::ico	tkimg/ico
-	img::jpeg	tkimg/jpeg	jpegtcl
-	img::pcx	tkimg/pcx
-	img::pixmap	tkimg/pixmap
-	img::png	tkimg/png	pngtcl, zlibtcl
-	img::ppm	tkimg/ppm
-	img::ps	tkimg/ps
-	img::raw	tkimg/raw
-	img::sgi	tkimg/sgi
-	img::sun	tkimg/sun
-	img::tga	tkimg/tga
-	img::tiff	tkimg/tiff	tifftcl, zlibtcl, jpegtcl
-	img::window	tkimg/window
-	img::xbm	tkimg/xbm
-	img::xpm	tkimg/xpm
-	-------------------------------------------------
-
-CONFIGURE
-
-The source distributions have "configure", which  has the following
-possibilities:
-	configure ?options?
-
-Some possible options:
-	--prefix=<dir>		Install headers in <dir>/include.
-				Default: "/usr/local"
-	--exec-prefix=<dir>	Install libraries in <dir>/lib.
-				Default: "${prefix}"
-	--with-tcl=<dir>	Find Tcl libraries in <dir> and include files in
-				<dir>/../include or <dir>/../generic.
-				Default: "${exec-prefix}/lib" or a sibling directory
-				of the Img build directory.
-	--with-tk=<dir>		Find Tk libraries in <dir> and include files in
-				<dir>/../include or <dir>/../generic.
-				Default: the same values as given by --with-tcl
-				or a sibling directory of the Img build directory.
-
-	Packages dependent on one or more of the support packages have
-	appropriate options to locate their libraries and headers, if
-	they cannot be found via --prefix and --exec-prefix
-
-	Use configure --help to query each configure for the full set
-	of options available to it.
-
-
-MAKE & INSTALL
-
-	'make', or 'make all' will build any package.
-
-	'make install' will install its headers and libraries in the
-	directories specified via --prefix/include and --exec-prefix/lib.
-
-USE
-
-If you want to use one or more of new image formats to be available in
-your own scripts, add a line like the following somewhere in your
-script:
-
-	package require img::FORMAT
-
-where FORMAT stands for the name of the format requested. See the list
-in section 'PACKAGES AND THEIR DEPENDENCIES' for the available
-formats. Each format will automatically load all of the packages it is
-dependent on.
-
-The line
-	package require Img
-
-is still legal and will load all format handlers provided by this
-extension except dted and raw.
-
-As an example, have a look at the file "demo.tcl"
-
-For further options see the manpages.
-
-
-DOCUMENTATION
-
-The documentation coming with the distribution is written in the
-doctools format (see tcllib).
-
-	NOTE:
-		The Img documentation makes use of features (include
-		files and variables) which are not part of an official
-		tcllib release yet. A cvs snapshot of tcllib is
-		required.
-
-
-
-PLATFORMS
-	tested:
-		Linux 2.0.30	(gcc, egcs)
-		IRIX 6.2	(cc, 32 bits only)
-		ULTRIX 4.1	(cc, gcc, egcs)
-		ULTRIX 4.4	(cc 3.0)
-		HP-UX-9		(cc, gcc, egcs)
-		HP-UX-10.2	(gcc, egcs)
-		SunOS-4.1.2     (cc)
-		Solaris 2.5	(gcc, egcs)
-		FreeBSD	2.2	(gcc, egcs)
-		Windows	95/98/NT(gcc-2.95/MS Visual C++ 4.2/5.0/6.0)
-
-	Not done yet:
-		Mac		) someone interested
-		VMS		) to try??????
-
-	Other machines and OS's should work too. 
-
-Feedback about other OS's and compilers is appreciated. Please
-help me in making this package better.
-
---
-		Jan Nijtmans
-		email: nijtmans@users.sourceforge.net
-		url:   http://purl.oclc.org/net/nijtmans/
-
-		Andreas Kupries, ActiveState Corp
-		email:	andreas_kupries@users.sourceforge.net	(private)
-			akupries@shaw.ca			(private)
-			andreask@activestate.com		(work)
-		url:	http://www.purl.org/NET/akupries/