Changes of unique constraint at table groups
alter table groups drop constraint GRP_NAM_VO_U;
alter table groups add constraint grn_nam_vo_parentg_u unique (name,vo_id,parent_group_id);
GUI: fixed add member to resource dialog

- Fixed some stuff in add member to resource dialog, like new group creation,
  buttons.
- Do not display "Add" button on resource service settings tab if service is pre-selected
  (case of creating resource).
Merge pull request #287 from zoraseb/changes_in_db_scripts

Changes of unique constraint at table groups
Merge pull request #289 from zlamalp/fixup

GUI: fixed add member to resource dialog
GUI: simplified URL for single tab

- when using tabs reference in URL, "active=1" part can be skipped
  and will be automatically added to the first tab when url is parsed.
Merge pull request #290 from zlamalp/url

GUI: simplified URL for single tab