vchoi_fork

[svn-r9529] Purpose:
Check in some new fixes for MPI derived datatype routines

Description:
MPI derived datatype algorithm seems working for a simple case;
however, there are still other problems need to be solved. So the
code cannot be used for the time being. Check-in only for debugging.
It won't affect other part of the library.
Solution:

Platforms tested:
Linux 2.4 (heping, serial and parallel)
(Since no new tests were added and changes are mostly restricted to
one fuction, no need to test three platforms).


Misc. update: