[svn-r168] Changes since 19980122

----------------------

./MANIFEST
	Added new files.

./src/H5D.c
	Added support for partial datatype I/O which is needed when
	merging struct members between file and disk.  This isn't the
	efficient version because the merge requires an extra gather
	(step 1b in my pipeline diagram) that isn't turned off when it
	isn't needed.

./src/H5T.c
./src/H5Tpkg.h
./src/H5Tprivate.h
./src/H5Tpublic.h
	Conversion functions take an extra argument which is a pointer
	to a blob of private data that can be used by the conversion
	function to save anything that's expensive to compute and
	is constant for a particular conversion path.

./src/H5Tconv.c
	Compound data type conversion is beginning to work!  We can
	handle conversions between compound types that have members
	which are not arrays.  It also supports partial conversion so
	we can omit certain members of the source and not clobber
	extra members in the destination.

./test/Makefile.in
./test/cmpd_dset.c	[NEW]
	Added a test case that demonstrates how to use compound data
	types in a dataset.  The output doesn't match the output of
	the other test cases yet, the the entire example is more
	readable and written entirely with the API.

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