Update cell icon only after computed filters were received #2761

This make the view slighlty less dynamic, in particular we lose the
'saving' status of a cell, but it allow us to significantly reduce
complexity for a big number of questionnaires
Update to NetBeans 8.0.1
Could not load QuestionnaireUsage
Merge cellMenu into cell directive #2761

This avoid creating unncessary scopes and directive parsing
Use events instead of $watch() to handle read-only #2761
Use events instead of watch to handle placeholder #2761