hdf5_ep

[svn-r3532] Purpose:
    Adding tests to the C++ API
Description:
    The C++ API has no formal testing yet.
Solution:
    Added tests for file and dataset interfaces.  I'm still working on
    other tests.
Platforms tested:
    Linux (gcc version egcs-2.91.66)
    I temporarily modified the Makefile on my local Linux machine and these
    tests work.  I need Bill to help adding them permanently before I can
    test on an NCSA machine.  I checked the files in now so Bill can do that.