Branch HEAD

some improvements:
-use fd->hints structure instead of MPI Info routines
-change hints name as romio requires
-check lustre/lustre_user.h header file in configure instead of giving
 the lustre structs/constants
-add new MPE logging
-revert the hint settings in ad_lustre_open.c
-remove the two confusing hints "contig_data" and "samesize"
-fix avail_cb_node calculation in ad_lustre_aggregate.c