OPAL-1929: Created widget for Namespaced attribute table, Allow to delete attributes
OPAL-1929: Edit/Delete multiple items. Adding a column for Edit/Delete a single item. Implemented authorization for checkbox and actions columns.
OPAL-1929: Fixing some warnings and removed commented out class
Merge pull request #363 from emorency/OPAL-1929

Opal-1929: Add/Delete in bulk and added actions column visible when authorized