lagrangian: Support meshToMesh mapping

Lagrangian is now compatible with the meshToMesh topology changer. If a
cloud is being simulated and this topology changer is active, then the
cloud data will be automatically mapped between the specified sequence
of meshes in the same way as the finite volume data. This works both for
serial and parallel simulations.

In addition, mapFieldsPar now also supports mapping of Lagrangian data
when run in parallel.

src/meshTools/patchToPatch/intersection/intersectionPatchToPatch.H

@@ -328,9 +328,9 @@ private:
             const primitiveOldTimePatch& tgtPatch
         );
 
-        //- Subset the local target patch so that only parts that actually
+        //- Trim the local target patch so that only parts that actually
         //  intersect the source remain
-        virtual labelList subsetLocalTgt
+        virtual labelList trimLocalTgt
         (
             const primitiveOldTimePatch& localTgtPatch
         );