add configure option for explicit nb progress
add ARMCI_MPI macro defined to RMA version targeted
add ARMCIX_Progress
add gmr_progress
add explicit progress calls in contig NB
add TODO regarding flag implementations
add target to nb handle - this might have led to incorrect results before
refactor for NB strided/vector implementation

1) copied blocking code into nonblocking impl in new source.
2) removed NB-calls-B impl in old source.
3) add new source to automake.
add declaration of ARMCII_Strided_to_dtype since strided_nb.c needs it
s/proc/target/g for consistency
check for null handles before dereferencing