A3t::findSubstitution

- Added support for standard and escaped '/from/to/g' constructs, which is an
  additional feature.

src/parser/A3t.h

@@ -47,6 +47,7 @@ private:
   void findFileOverride ();
   void findConfigOverride ();
   void findPattern ();
+  void findSubstitution ();
   void validate ();
 
 private: