hdf5_ep

[svn-r9945] Purpose:
Bug fix

Description:
h5diff_main.c contained some debug printf statment that produced
unexpected output. Commented them out.

testh5diff.sh: implemented code to test ph5diff tests but
ph5diff has some errors that generated unexpected output.
Temporary hacked to skip tests if run by daily test account.

Platforms tested:
Tested in heping, serial and parallel.