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- was previously limited to 'char' whereas gatherv/scatterv already supported various integer and float types STYLE: rebundle allToAll declarations with macros ENH: provide a version of allToAllConsensus returning the Map - simplifies use and avoids ambiguities in the send/recv parameters - the Map version will now also transmit zero value data if they exist in the Map. Unlike the List version, zero values are not necessary to signal connectivity with a Map. COMP: forwarding template parameters for NBX routines ENH: consolidate PstreamBuffers size exchange options - had a variety of nearly identical backends for all-to-all, gather/scatter. Now combined internally with a dispatch enumeration which provides better control over which size exchange algorithm is used. DEFEATURE: remove experimental full-NBX PstreamBuffers variant - no advantages seen compared to the hybrid NBX/PEX approach. Removal reduces some code cruft. DEFEATURE: remove experimental "double non-blocking" NBX version - the idea was to avoid blocking receives for very large data transfers, but that is usually better accomplished with a hybrid NBX/PEX approach like PstreamBuffers allows