New model ResourceState

- added new class ResourceState
- added method getResourcesState
GUI: when creating Facility always pass backup list

- Pass content of "backup list" from list of Facilities when
  creating new Facility, since simple "list" might be empty/filtered.
Merge pull request #402 from zlamalp/gui

GUI: when creating Facility always pass backup list
Fix UF:D:defaultUnixGID module

attribute GR:D:isUnixGroup is no longer used. You can tell if group is
unix group according to G:D:unixGroupName-namespace - if it is set, the
group is unix group.