GUI+REGISTRAR: fixed vo-group application usecase

 - fixed missing params when redirect
 - fixed proper params read from URL
 - redirect existing when outside extension period
 - redirect new if duplicate registration attempt
 - fixed case, when user is not yet member of VO and have group application submitted
 - fixed case, when user is member of vo and want apply to group (in extension period)
Merge pull request #41 from zlamalp/app_fix

GUI+REGISTRAR: fixed vo-group application usecase