change getAllGroups to getAllRichGroupsWithAttrsByName in VoGroupsTabItem
add clicable sync column to VO groups and group subgroups.
add new cell definition - CustomClicableInfoCellWithImageResource
change load class from Group to RichGroup
Change bullets for rendering sync state and change texts in info box
Merge branch 'master' of github.com:ondrejvelisek/perun into ondrejvelisek-master
GUI: Optimized RichGroup

- RichGroup extends Group.
- Moved column to left, smaller column.
- Tweaked texts in info box.
- Removed DeleteRichGroups, use simple DeleteGroups.
CORE: Simplified and exact authorization for group admin and subgroups.

- Specify VO for GroupAdmin in GetAllRichGroupsWithAttributesByNames.
- Use only parentGroup for VoAdmin in GetRichSubGroupsWithAttributesByNames.
  to save up one DB select.
Merge pull request #501 from ondrejvelisek/master

- Add column with information about group synchronization in a table.
- Merged with local changes.