TUT: simplify setups.orig cases

DOC: Curle: fix typo in header file (fixes #2498)

TUT: airfoil2D: apply standard freestream conditions for nuTilda and nut

tutorials/verificationAndValidation/schemes/nonOrthogonalChannel/Allclean

@@ -3,11 +3,7 @@ cd "${0%/*}" || exit                                # Run from this directory
 . ${WM_PROJECT_DIR:?}/bin/tools/CleanFunctions      # Tutorial clean functions
 #------------------------------------------------------------------------------
 
-cleanCase0
-
-rm -rf 0.orig
-rm -rf system
-rm -rf constant
+rm -rf setups
 rm -rf results
 rm -rf plots