Vector: make arithmetic ops member funcs again to ease language bindings
Vector: make arithmetic ops member funcs again to ease language bindings

and maintain backwards compatibility
OGRECave/ogre,OGRECave/ogre,paroj/ogre,paroj/ogre,paroj/ogre,OGRECave/ogre,OGRECave/ogre,OGRECave/ogre,paroj/ogre,paroj/ogre