improve MergeRequest edit page
Mention Merge requests on forks in changelog
Fix assign-to-me buttton
Fix form mr issue with ci
Update User api to respect default settings

-API now respects default_projects_limit, default_can_create_group, and default_can_create_team

Change-Id: I059d060d576df1050e5371e707381c5e8c608a7a