Changes in createGroup and updateGroup methods

- createGroup (for Vo and parentGroup) and updateGroup now work only with group.shortName
- group.name is correct when these methods return object Group back
- add changes in javadoc of these methods
GUI: send shortName as new name in group object

- When updating group (name+description) set new shortName
  as name of group in order to update without mistakes in ":".
Changes in create and update group input parameter

Create and update group no longer require group.name, they work only
with group.shortname.