hdf5_ep

[svn-r7792] Purpose:
h5diff new features
bug fix

Description:
implemented the diff for STRING and ARRAY types
fixed a bug. when the datasets are empty, do not try to compare them .
the check empty is made with H5Dgetstorage_size

Solution:

Platforms tested:
linux
solaris 5.7
IRIX

Misc. update: