ENH: extend parProfiling (#2737)

- separate broadcast times from reduce/gather/scatter time
- separate wait times from all-to-all time
- support invocation counts, split off requests time/count
  from others to avoid flooding the counts

- support 'detail' switch to increase the output information.
  Format may change in the future

src/Pstream/mpi/UIPstreamRead.C

@@ -61,8 +61,7 @@ void Foam::UIPstream::bufferIPCrecv()
         );
         MPI_Get_count(&status, MPI_BYTE, &messageSize_);
 
-        // Assume these are from gathers ...
-        profilingPstream::addGatherTime();
+        profilingPstream::addProbeTime();
 
         recvBuf_.resize(messageSize_);
 
@@ -206,7 +205,7 @@ Foam::label Foam::UIPstream::read
             return 0;
         }
 
-        profilingPstream::addWaitTime();
+        profilingPstream::addRequestTime();
 
         if (debug)
         {