hdf5_ep

[svn-r10125] Purpose:
Feature--to provide a standalone mode for t_mpi.c so that it can
be built outside of PHDF5 environment.

Description:
Move definitions that are common to all parallel test programs
to a new header file called testpar.h.
Leave only Parallel HDF5 tests related definitions in testphdf5.h.

Platforms tested:
heping (pp) and modi4(PP).  Copper was down.

Misc. update: