Map move events are screwy

[euzuro]

In examples/lite.html's init() function, register the following two events so we can track the "movestart" and "moveend" events:

	        map.events.register("moveend", null, function() {
	            console.log("end");
	        });
	        map.events.register("movestart", null, function() {
	            console.log("start");
	        });

Now open lite.html in firefox and open the firebug console.

click and drag the map: notice that start and end both fire at the *end* of the drag

now click on one of the arrows in the panzoombar. start fires at beginning of pan, end at the end of it. beautiful.

now click and drag the map again: we get an end fired at the beginning of the drag, then the start and end as before at the end.

[crschmidt]

Tim actually fixed at least part of this: r5674

I broke it accidentally: r6099

[crschmidt]

Attached patch solves the double-moveend: Specifically, we need to tell panTween we're not playing anymore after calling 'done', not just when 'stop' is called -- stop is more well termed 'cancel', which is not called regularly.

[crschmidt]

Bring back dragging, in a slightly different way so that we can actually fix this bug with one stone

[euzuro]

brilliant.

all tests pass ie6, ff. please commit.

thank you, infinitely. great work

[crschmidt]

r6398