Path handler: create APIFunction from dblclick internals

[bartvde]

If someone wants to write a tool (button) which finishes the geometry instead of using double click, e.g. since they are working on a tablet device, they now have to use an internal method of OpenLayers.Handler.Path with a fake event object.

I propose to move the internals of the dblclick handler into a new APIMethod which can also be called externally, and then use that method in the dblclick handler.

[bartvde]

Please review.

[erilem]

It looks good. Please commit if you can confirm that Handler.Path tests still pass.

[erilem]

Fixed with r10847.

[bartvde]

Thanks erilem, I did not know the closes hook is still down :-)