GUI: many usability fixes

- Do not rebuild oracle on each filter event for RichDestinations
- Added filtering for ext sources and vo ext sources, used when adding
- Allow multiple add vo/group/facility manager without closing the tab
- Suggestions when filtering groups takes ":" as whitespace so we
  can now filter also between subgroups in same table
  (e.g. "ncbr:kulhanek" is offered now if "kul" is in input).
- Added filtering on groups on Member's groups tab.
- Added filtering on groups on GroupAdmin's SelectGroup tab.
- Put "No resource available" in selectionbox on GroupSettings tab
  if group is not assigned to any resource (prevented switching to
  members settings)
- Better cross-site request exception message.
CORE+GUI: usability and compatibility fixes

CORE
 - Fixed postgres compatibility when getMembersCount() selected by
   status and vo. Type of status column is 'char' and must match
   passed parameter in query() method.

GUI
 - Use entities names in result messages for add/remove member/manager
 - Fixed rebuilding of oracle in GetAllGroups.
 - Added filtering on groups,services and tags assigned to resource.