hdf5_ep

[svn-r3842] Purpose:
    New feature
Description:
    Added a parallel HDF5 example.  make check knows how to
    run it in serial mode but not in parallel mode since the
    current makefile has no provision for parallel code execution.
    One would have to do it by hand (e.g., mpirun -np 2 ./ph4example)
Platforms tested:
    modi4 (serial and parallel)