General cleanup.
Create cellEditors by default for all tables, override TableColumn to
disable cellEditors. Fix Custom Combo CellEditor.
Fix ComboObjectEditor notifyChanged() algorithm.
Fixed jbpm model loader to handle arbitrary strings in Interface and
Operation implementationRef references. Combined duplicated attributes
from jbpm "Diagram", "Process" and "Description" tabs. Combined
implementationRef FeatureDescriptors for Interface and Operation
ExtendedPropertyAdapters. Fixed "Interfaces" tab in jbpm target runtime.
Force change in helios Activator in UI plugin
More cleanup.
Fix remaining jbpm activity property tabs.
Fix bug with replaceTab in <propertyTab> definitions.
Fix missing "default flow" for jbpm gateways.
Minor bug fix in extension model decoration