tutorials: Renamed .org -> .orig

See http://www.openfoam.org/mantisbt/view.php?id=2076
  - .org is the file extension for emacs org-mode as well
  - .orig is more to the point (.org isn't always recognized as "original")
  - .original is too long, although more consistent with the convention
    of source code file naming

Update script contributed by Bruno Santos

tutorials/incompressible/pimpleDyMFoam/oscillatingInletACMI2D/Allrun.pre

@@ -14,4 +14,4 @@ runApplication createBaffles -overwrite
 # remove zero-sized patches
 runApplication createPatch -overwrite
 
-cp -rf 0.org 0
+cp -rf 0.orig 0

tutorials/incompressible/pimpleDyMFoam/propeller/Allrun.pre

@@ -31,4 +31,4 @@ runApplication createPatch -overwrite
 #runApplication moveDynamicMesh -checkAMI
 
 # - set the initial fields
-cp -rf 0.org 0
+cp -rf 0.orig 0

tutorials/incompressible/pimpleDyMFoam/wingMotion/Allrun

@@ -13,14 +13,14 @@ runApplication snappyHexMesh -overwrite
 cd ../wingMotion2D_simpleFoam
 runApplication extrudeMesh
 runApplication createPatch -overwrite
-cp -r 0.org 0
+cp -r 0.orig 0
 runApplication simpleFoam
 
 # Copy the mesh from the steady state case and map the results to a
 # mesh motion case, then solve transient.
 cd ../wingMotion2D_pimpleDyMFoam
 cp -r ../wingMotion2D_simpleFoam/constant/polyMesh constant
-cp -r 0.org 0
+cp -r 0.orig 0
 runApplication mapFields ../wingMotion2D_simpleFoam -sourceTime latestTime -consistent
 mv 0/pointDisplacement.unmapped 0/pointDisplacement
 runApplication decomposePar