used as a generic api for registering actions which can apply to
a specific map layer or layer type.
Create a QgsMapLayerAction for setting features as the current
atlas feature for compositions.
This work was kindly sponsored by SIGE (www.sige.ch).
* With a selection model, the way the attribute table handles selections
can be customized. E.g. synchronized to layer selection or used to pick
features.
* With request filters, the visible features on an attribute table can be
limited. This will effectively reduce the subset of features the attribute
table works on. Additional filters by means of a proxy model can of course
further reduce the visible subset subsequently.
