refactor: move distributed awareness from BGL to PBGL - #47
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Companion to boostorg/graph#583, which removes all MPI/PBGL awareness from BGL (full rationale there). This PR makes PBGL own it:
boost/graph/use_mpi.hppmoves here, same path. It now re-hosts the sequential -> distributed forwarding by including the distributed algorithm headers directly, and carries the relocatedbfs_helperforward declaration and MPI serialization traits (newdistributed/detail/property_serialize.hpp).User contract unchanged: include
<boost/graph/use_mpi.hpp>first, then any sequential BGL header; the distributed overloads appear as before.Merge order / CI: #583 lands first. Until it merges and the superproject's
libs/graphpointer advances, CI here builds against old BGL (duplicateuse_mpi.hpp) and is expected red.