ENH: Make more commands scriptable

Source/cmMakeDirectoryCommand.h

@@ -50,6 +50,11 @@ public:
    */
   virtual const char* GetName() { return "MAKE_DIRECTORY";}
   
+  /**
+   * This determines if the command is invoked when in script mode.
+   */
+  virtual bool IsScriptable() { return true; }
+
   /**
    * Succinct documentation.
    */