tutorials: Removed 0.orig directories in favor of <field>.orig

The new automated <field>.orig reading has made 0.orig directories and
associated scripting redundant.

tutorials/basic/potentialFoam/cylinder/Allclean

@@ -4,7 +4,7 @@ cd ${0%/*} || exit 1    # Run from this directory
 # Source tutorial clean functions
 . $WM_PROJECT_DIR/bin/tools/CleanFunctions
 
-rm -rf 0 > /dev/null 2>&1
+find 0 -type f  ! -name "*.*" -delete > /dev/null 2>&1
 
 cleanCase
 

tutorials/basic/potentialFoam/cylinder/Allrun

@@ -6,7 +6,6 @@ cd ${0%/*} || exit 1    # Run from this directory
 
 application=`getApplication`
 
-cp -r 0.orig 0 > /dev/null 2>&1
 runApplication blockMesh
 runApplication $application -withFunctionObjects -writePhi -writep
 runApplication postProcess -func streamFunction

tutorials/basic/potentialFoam/pitzDaily/Allclean

@@ -4,7 +4,7 @@ cd ${0%/*} || exit 1    # Run from this directory
 # Source tutorial clean functions
 . $WM_PROJECT_DIR/bin/tools/CleanFunctions
 
-rm -rf 0 > /dev/null 2>&1
+find 0 -type f  ! -name "*.*" -delete > /dev/null 2>&1
 
 cleanCase
 

tutorials/basic/potentialFoam/pitzDaily/Allrun

@@ -6,7 +6,6 @@ cd ${0%/*} || exit 1    # Run from this directory
 
 application=`getApplication`
 
-cp -r 0.orig 0 > /dev/null 2>&1
 runApplication blockMesh
 runApplication $application -writePhi -writep
 runApplication postProcess -func streamFunction