hdf5_msb

[svn-r12295] Purpose:
Several bug fixes

Description:
Added config file for Cray X1 (previous file was misnamed)
Simplified some code in hyperslab.c test that seemed to have been
confusing compiler on Cray X1.
Fixed typo in config/commence.am
Cleaned up hl/src/Makefile.am

Solution:
All four fixes should be straightforward.  The failure on Cray was
very difficult to debug, but involved arithmetic errors.
This change seems to fix it.

Platforms tested:
heping, copper, sol, some Cray X1 (more testing when system comes back up)