tutorials/propeller: Mesh AMI-s as a face-zone, rather than patches

snappyHexMesh now generates a face-zone for the AMI-s, and createBaffles
and mergeOrSplitPoints -split are used to create the patches. Before,
snappy generated AMI patches directly, which were then converted to
AMI-s with createPatch.

This way, the AMI-s match exactly at the start of the simulation. For
more complicated cases that may be derived from this tutorial, this
could be important.

tutorials/multiphase/interPhaseChangeFoam/propeller/Allclean

@@ -5,7 +5,7 @@ cd ${0%/*} || exit 1    # Run from this directory
 . $WM_PROJECT_DIR/bin/tools/CleanFunctions
 
 # remove surface
-rm -f constant/triSurface/propellerTip.obj.gz > /dev/null 2>&1
+rm -f constant/triSurface/propeller.obj.gz > /dev/null 2>&1
 
 cleanCase