Feature #1060: AMPI compliance with MPI-3.1 standard
AMPI support for MPI-3's request-based RMA routines
MPI-3 added request-based RMA routines Rput, Rget, Raccumulate, and Rget_accumulate. They are analogous to the two-sided immediate/non-blocking routines such as Isend.
Add an initial implementation that simply sets the request to MPI_REQUEST_NULL, and a real implementation to the patch in gerrit for RDMA sender-side copy avoidance: https://charm.cs.illinois.edu/gerrit/#/c/1312/