Support initial extent defined by the admin

With LizMap-Plugin, the admin can define an initial Extent to the map.
This extent is different than the maxExtent provided by the Web Map Service definition.
The map is automatical zoomed to a city center or the best place of interest on the map.
Using Openlayers Permalink

Layers, zoom, lat and lon params can be used to have a permalink.
A good effect of this integration is that lizMap is faster.
Admin - Add user group id in main group edition page