hdf5_ep

[svn-r10204] Purpose:
Provide a way to warn users on the usage of collective IO because of
potential MPI-IO bugs for some platforms.
Also provide a way for users to give us feedback if the vendor has
already fixed the problem so that we can turn off the hard-code macro
in our configure description file.

Description:
See above.


Solution:
Use a simple MPI complicated derived datatype program to check
whether derived data type works for this MPI-IO package.
Print out some messages to warn users if not working as we had expected.

Platforms tested:
AIX 5.1(copper) and Linux 2.4(heping)

Misc. update: