----------------------
./doc/html/Datatypes.html
./test/dtypes.c
Added documentation and tests for opaque types.
./tools/h5ls.c
Added a `-x' or `--hexdump' argument which is not fully
implemented (because I want to synchronize h5tools.c first)
but which will eventually print raw data in hexadecimal format
without any translation from disk. This would be useful for
debugging references and VL types.
./tools/h5tools.c
Added support for references (not quite finished yet, but
compiles -- I wanted to sync up this file before Patrick and I
got too far apart...)
./src/H5R.c
Checked for error return value from H5R_get_object_type()
./src/H5A.c
./src/H5D.c
Changed error return values from NULL to FAIL
./test/Makefile.in
./test/trefer.c
Creates trefer1.h5 and trefer2.h5 so that the second test
doesn't clobber the first file since the files might be useful
for debugging.