hdf5_ep

[svn-r18743] enhancement 1853:
Install packed-bits feature for h5dump.

Allen has installed the feature in the NPOESS feature branch.
I ported it back to the v1.8 branch for v1.8.5 release.

tools/h5dump/testh5dump.sh.in:
    Added tests for the packed-bits feature.
tools/h5dump/h5dump.c
tools/h5dump/h5dump.h
    Added code to parse and handled the packed-bits request.
tools/lib/h5tools.h
tools/lib/h5tools_str.c
tools/lib/h5tools.c
    Added code to print packed-bits.
tools/testfiles/tpackedbits2.ddl
tools/testfiles/tnofilename-with-packed-bits.ddl
tools/testfiles/tpackedbits.ddl
    Expected output files for packed-bits feature.

Tested:
    h5committested the NPOESS branch.
    Tested in the linux VM machine in my Dove.