[OpenLayers-Dev] #1666 - One Single, Mother Of All Vector Layers

[Matthias Pohl]

This is the first attempt to implement the "One Single, Mother Of All
Vector Layers" approach as described in issue #1666. See a working
example and details on the project page http://ol.m-click.ws

- the patch URL is http://ol.m-click.ws/grouping-vector-features.patch
- the patch is tested with version 2.7 and trunk
- it works fine in our application (no performance issues)
- no BC breaks
- of course needs testing (VML)
- a new "sublayer" switch has to be added to the OL layerswitch control

Please review and comment.

Regards, matt