STYLE: communication name "buffered" instead of "blocking"

- "buffered" corresponds to MPI_Bsend (buffered send),
  whereas the old name "blocking" is misleading since the
  regular MPI_Send also blocks until completion
  (ie, buffer can be reused).

ENH: IPstream::read() returns std::streamsize instead of label (#3152)

- previously returned a 'label' but std::streamsize is consistent with
  the input parameter and will help with later adjustments.

- use <label> instead of <int> for internal accounting of the message
  size, for consistency with the underyling List<char> buffers used.

- improve handling for corner case of IPstream receive with
  non-blocking, although this combination is not used anywhere

applications/utilities/mesh/manipulation/createPatch/createPatch.C

@@ -568,10 +568,9 @@ void syncPoints
                     }
                 }
 
-                // buffered send
                 OPstream toNbr
                 (
-                    UPstream::commsTypes::blocking,
+                    UPstream::commsTypes::buffered,
                     procPatch.neighbProcNo()
                 );
                 toNbr << patchInfo;

applications/utilities/preProcessing/mapFieldsPar/MapVolFields.H

@@ -48,7 +48,7 @@ void evaluateConstraintTypes(GeometricField<Type, fvPatchField, volMesh>& fld)
 
     if
     (
-        commsType == UPstream::commsTypes::blocking
+        commsType == UPstream::commsTypes::buffered
      || commsType == UPstream::commsTypes::nonBlocking
     )
     {