ENH: additional input/output parameters for lumped point motion (closes #804)

- input or output scaling of values to manage dissimilar unit systems
  in the structures model

- logging of communicated force, moments and updated positions.
  This allows tracking of the information exchange throughout the
  duration of the simulation and may assist in post-simulation diagnosis.

src/lumpedPointMotion/lumpedPointDisplacementPointPatchVectorField.C

@@ -250,7 +250,7 @@ void Foam::lumpedPointDisplacementPointPatchVectorField::updateCoeffs()
 
             if (Pstream::master())
             {
-                movement().writeData(forces, moments);
+                movement().writeData(forces, moments, &(db().time()));
 
                 // Signal external source to execute
                 movement().coupler().useSlave();