ENH: Added new ceeateZeroDirectory utility

Uses a system/caseProperties file to select templates from
etc/caseDicts/createZeroDirectoryTemplates to enable high-level setup
of a case.
See
- etc/caseDicts/createZeroDirectoryTemplates
- tutorials/preProcessing/createZeroDirectory

tutorials/preProcessing/createZeroDirectory/snappyMultiRegionHeater/Allclean

@@ -0,0 +1,21 @@
+#!/bin/sh
+cd ${0%/*} || exit 1    # run from this directory
+
+# Source tutorial clean functions
+. $WM_PROJECT_DIR/bin/tools/CleanFunctions
+
+rm -rf constant/extendedFeatureEdgeMesh > /dev/null 2>&1
+rm -f constant/triSurface/*.eMesh > /dev/null 2>&1
+rm -f constant/polyMesh/boundary
+
+cleanCase
+rm -rf VTK
+rm -rf constant/cellToRegion constant/polyMesh/sets
+rm -rf 0
+rm -rf constant/bottomAir/polyMesh
+rm -rf constant/topAir/polyMesh
+rm -rf constant/heater/polyMesh
+rm -rf constant/leftSolid/polyMesh
+rm -rf constant/rightSolid/polyMesh
+
+# ----------------------------------------------------------------- end-of-file