FIX: provide restore0Dir function to fix issue #159

- makes it easier to ensure the correct behaviour, consistently

tutorials/multiphase/compressibleMultiphaseInterFoam/laminar/damBreak4phase/Allrun

@@ -7,8 +7,7 @@ cd ${0%/*} || exit 1    # Run from this directory
 # Set application name
 application=`getApplication`
 
-\rm -rf 0
-cp -r 0.org 0
+restore0Dir
 
 runApplication blockMesh
 runApplication setFields