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
make engine ignore facilities (for testing of new engine)

{alcor,aldor,ascor,torque}.ics.muni.cz
Lower number of gen workers in Engine

- Due to new functionality with preferred unix GID, gen services using
	this new attribute takes more time to get data therefore generating
	process ends on apache timeout.
- This patch lowers number of gen workers. Hopefully this decrease stress
	on core and even passwd gen services returns data before apache
	timeout.