- simplifies coding
* finishedRequest(), waitRequest(), waitRequests() with parRun guards
* nRequests() is noexcept
- more consistent use of UPstream::defaultCommsType in branching
- gather/scatter types of operations can avoid AllToAll communication
and use simple MPI gather (or scatter) to establish the receive sizes.
New methods: finishedGathers() / finishedScatters()
- less communication than gatherList/scatterList
ENH: refine send granularity in Pstream::exchange
STYLE: ensure PstreamBuffers and defaultCommsType agree
- simpler loops for lduSchedule
- used Pstream::maxCommsSize (bytes) for the lower limit when sending.
This would have send more data on each iteration than expected based
on maxCommsSize and finish with a number of useless iterations.
Was generally not a serious bug since maxCommsSize (if used) was
likely still far away from the MPI limits and exchange() is primarily
harnessed by PstreamBuffers, which is sending character data
(ie, number of elements and number of bytes is identical).
