REGISTRAR,GUI: improved UX when searching for similar users

- Fixed search for similar users before/after application is submitted.
- Search now returns RichUsers instead of Users and contain organization and email attribute to help
  users/admins distinguish if it's really same person or not.
- Search fo similar users is now possible also for non-authz users, when their latest submitted application
  is used to perform search.
- When getting applications, they are returned ordered by id desc, so latest are displayed on top of table
  in GUI and GUI doesn't need to perform sorting.