ADD reporting of lat/long of mouse cursor when you press L. This is in response to...

ADD reporting of lat/long of mouse cursor when you press L. This is in response to trac.openstreetmap.org/ticket/3509 . I'm not very familiar with event-oriented programming, so I've probably done this wrong. I ended up creating new MapEvent types which doesn't feel right somehow. But it works...someone else can perhaps tell me the right way to have done this.