* fix add subgroup issue FED-1101
* fix subgroup by None assignee FED-1100
* fix grouping by asignee or labels FED-1096
* fix create view popup FED-1093
* fix subgroup exception in swimlanes
* fix show sub issue filter FED-1102
* use Enums instead of numbers
* fix Estimates setting permission for admin
* disable access to project settings for viewers and guests
* fix project unautorized flicker
* add observer to estimates
* add permissions to member list
