New method getDestinations(sess)

- added new method getDestinations(PerunSession sess) into ServiceManager
- added into RPC enum
REGISTRAR: check for similar users when auto-approving application

- If VO's initial application is set to auto-approve mode, then stop
  the process, when similar users are found and notify VO admin
  about the problem. Application can be then approved manually.

- Other types of application doesn't create new User, so we don't have
  to check for similar users.
getExtSourceAttributes moved to getExtSourceById

- getExtSourceAttributes erased and all its functionality is now in
  getExtSourceById
- added new mapper for attributes from table ext_sources_attributes
- setAttribute method added into ExtSource object
Added test for getDestinations
checkAttributeValue for host added to rpc

- also, in checkAttributeValues RpcExceptionMessage changed
new tool copyRegMails allowed to copy notification mails related
to registration. Tool copyForm is updated to allow copy registration
Form together with notification mails.
REGISTRAR: fixed check for similar users

- If latest application is not found, then return empty list.
Merge pull request #438 from zlamalp/fixup

REGISTRAR: fixed check for similar users
GUI: updated RT reporting

- Pass also actor/extSource to ticket if user==null so we would
  know, who sent the error request.
- Fixed text before instance string.
Merge pull request #439 from zlamalp/rt

GUI: updated RT reporting
Merge pull request #431 from zlamalp/nonapprove

REGISTRAR: check for similar users when auto-approving application
REGISTRAR: catch other exceptions too when auto-approving

- When auto-approving application, catch also UserExtSourceNotExists
  and ExtSourceNotExists exceptions, since it means, that user is unknown
  and we can't allow to approve Group initial application.
GUI: added more available tag options to help

- Added more available tags when creating/editing notifications.
Merge pull request #440 from zlamalp/registrar

REGISTRAR: catch other exceptions too when auto-approving
Merge pull request #436 from zoraseb/copyregmails

CLI tools to copy application form items and notification mails

- CLI tool to copy application form between VOs and Groups.
- CLI tool to copy application mails between VOs and Groups.
- When copying application form items, you can copy mails too using -m.
Merge pull request #432 from Natrezim/extSourceRebase

getExtSourceAttributes() moved to getExtSourceById()

- getExtSourceAttributes() erased and all its functionality is now in getExtSourceById().
- added new mapper for attributes from table ext_sources_attributes.
- setAttribute() method added into ExtSource object.
Merge pull request #406 from Natrezim/getDestinations

New method getDestinations(sess)
GUI: allow application verification only to Perun admins

- VO/Group manager can no longer verify submitted application
  (verify email address). Only PerunAdmin can.
Merge pull request #441 from zlamalp/valid

GUI: allow application verification only to Perun admins
Merge pull request #433 from Simcsa/rpc

checkAttributeValue() for host added to RPC