Mapserver: enhancements of searching with GetFeatureInfo request
wmsprovider: store tileWidth and tileHeight values in properties of wms provider
Fix multilabeling with datadefined value
new map tool to select single feature
add mapCanvas and messageBar to attribute editor context
use a specific class for the widget (to be used as a custom widget), rename old _widget to _wrapper
can select related feature on the map from the relation reference widget (in the attribute form)
also makes attribute form non modal
custom widget for relation reference widget