Add correct support for getFeatureInfo.

getFeatureinfo needs information about what is shown exactly
on the screen to give the correct answers.

The search now include width, height, bbox and cql_filters.

Conflicts:
	CHANGES.rst
	lizard_map/static/lizard_map/lizard_map.js
	lizard_map/views.py
rm old unused viewstate fetch method; allow daterange overrides in settings

Conflicts:
	lizard_map/templates/lizard_map/lizardgis.html
Remove animatible layer support.

The code was in the way and it wasn't used anymore.