ENH: add canCompile test to RunFunctions

- allow conditional skipping of tutorials (for example) if wmake or
  the expected compiler is not available

tutorials/mesh/refineMesh/refineFieldDirs/Allrun

@@ -3,6 +3,12 @@ cd "${0%/*}" || exit                                # Run from this directory
 . ${WM_PROJECT_DIR:?}/bin/tools/RunFunctions        # Tutorial run functions
 #------------------------------------------------------------------------------
 
+if ! canCompile
+then
+    echo "skipping tutorial $PWD"
+    exit 0
+fi
+
 wmake calcRadiusField
 wclean calcRadiusField