Bug fixed: Edit button for group-node listed only to either owner of the node or superuser
Bug fixed: Merge & Revert buttons listed only to either owner of the node or superuser
Bug fixed: User-group included in drop-down list, even if list exceeds maximum count of nodes (i.e. 10)
Merge pull request #531 from AvadootNachankar/mongokit

Minor bug fixes - Edit button for group-node; Merge & revert buttons; groups drop-down list