Support cadastral web map tooltip

Prepare https://github.com/geoadmin/mf-geoadmin3/issues/692

Backward compatibility is ensured.

Add support for cadastral web map
Add 2 parameters to htmlpopup service (mapExtent, imageDisplay -> use default values when not defined, parameters parsing is performed thanks to the parent class)
Update examples
Add one test for cadastral web map
Limit features retrieving to 50 (in the law)