particle: Removed polyMesh reference

This reference represents unnecessary storage. The mesh can be obtained
from tracking data or passed to the particle evolution functions by
argument.

In addition, removing the mesh reference makes it possible to construct
as particle from an Istream without the need for an iNew class. This
simplifies stream-based transfer, and makes it possible for particles to
be communicated by a polyDistributionMap.

applications/utilities/parallelProcessing/reconstructPar/reconstructLagrangianPositions.C

@@ -70,7 +70,7 @@ void Foam::reconstructLagrangianPositions
                     ppi.coordinates(),
                     mappedCell,
                     mappedTetFace,
-                    ppi.procTetPt(mesh, mappedCell, mappedTetFace)
+                    ppi.procTetPt(meshes[i], mesh, mappedCell, mappedTetFace)
                 )
             );
         }