CORE: fixed RichGroup object.

- RichGroup was missing voId parameter.
- simplified getRichGroupByIdWithAttributesByNames() where we don't need to
  get VO at all and there is no reason to check group for existence, since
  it's performed by select itself.
GUI: update to sync state on groups

- Display "authoritative" sync as a star.
- Sortable sync column.
- Image title display basic info about sync on hover.
- Display sync info on group's detail.
- Get EntityById supports RichGroup.
- Source format.
Merge pull request #506 from zlamalp/group

CORE: fixed RichGroup object
Merge pull request #507 from zlamalp/gui

GUI: update to sync state on groups