Performance issue with GeometryProperty

Add layers from a service that has an identifier like (http://myproduct.mycompany.com) may result into blocking operations in GeometryProperty because of the URL.equals implementation. It properly depends on infrastructure and network settings (proxy).

Solution: collect Layer-ID's as String in a set and compare these (see attached patch).

See also javadoc of "equals" method in java.net.URL class ('Since hosts comparison requires name resolution, this operation is a blocking operation.')