GUI:  support group, group_resource attributes together on group settings tab

 - Allow to set/remove group & group_resource attributes together on
   group settings tab. Also adding new attributes support new unified method.
-  Fixed confirms design when setting values to all members of group.

Before merging this commit to master, Fixes for tasks #1461 and #1462 must be merged.
GUI: fix IDS when setting new attribute fails

- In case Exception is thrown when setting new attributes,
  we must remove ids "workWithUserAttributes" and "workWithGroupAttributes"
  so inner method can properly decide namespace for another setAttributes() try.
Merge pull request #214 from zlamalp/groupResource

GUI: Group resource