Move features to their own module cmtls_features.
Add dynamic map markers and layers

- taxonomy for markers CT marker
- OpenLayers layer for each taxonomy term.
Change marker widget.
Add taxonomy layers defaulting to applications.
Add layer filtering to application level maps.
Add default map marker.
Add map defaults

through a map whose configuration gets transferred to other maps.
Change the side map center and zoom

so the point would always be centered.
Change CT marker field weights.
Rename Marker to Map layer.
Add CT features module.
Restrict content and application creation

- add warning when group and application is not set
- make group and application fields required and single valued.
Enable CT features module on update.
Remove comment preview.
Rename markers to layers.