Changed tutorial so mesh subset has an effect
New MRFZone algorithm ignores all non-wall patches
BUGFIX: Changed MRFZone algorithm so it works only on wall patches instead of all non-coupled, non-empty patches, which caused problems on inlets and outlets in MRF zone. Author: Dominik Christ. Merge: Dominik Christ.
BUGFIX: The polyMesh is now picked up from constant/setSubset directory; before subsetting had no effect on mesh. Author: Dominik Christ. Merge: Dominik Christ.