TUT: basic, IO, preProcessing, VV: clean up tutorials

- TUT: mesh: add missing SnakeRiverCanyon files
- TUT: mesh: add missing cp source in a foamyHexMesh tutorial

tutorials/verificationAndValidation/atmosphericModels/atmDownstreamDevelopment/Allclean

@@ -0,0 +1,14 @@
+#!/bin/sh
+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 results
+rm -rf plots
+
+#------------------------------------------------------------------------------