Relaxation and solution parameters for the final iteration in PIMPLE loops are
now selected according to the value of the "finalIteration" entry in the
mesh::data dictionary.

rhoPimpleFoam significantly updates and now replaces rhoPisoFoam.

- renamed surface regions (formerly patches or groups) to surfZone.

- added surfMesh, but without any of the patch information needed to make it
  useful for finiteArea.

- promoted coordinateSystem transformation to surfaceMeshConvert and moved
  old to surfaceMeshConvertTesting.