Nyall Dawson 85a17c246a Add QgsMapLayerAction and QgsMapLayerActionRegistry, which can be
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).
2014-01-20 21:35:56 +11:00
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