autocomplete: improve the lookup of value_display by re-using the object. - in case of unicode email the previous method could generate wrong data, and make search not show up such users.

admin: fixed search in user admin page

user-groups: new selector for user group memebers. - removed old two column selector in replacement of autocomplete list - scales much better for alrge number of users - still allows to select single users and user groups - fixes #4291 (user group shows only username in members)

system-info: fix possible float division by zero in calculating % value

ui: fixed problem with display of dt elements, fixes #4277

auth: Allow auth plugins to customize the slug which is used to generate URLs. #4078

pull-requests: moved the delete logic into the show view. - delete from pr view is more intuitive - there was several support queries about beeing confused how to delete a pr

pull-requests: redo my account pull request page with datagrid. Fixes #4297 - consistent ui with per-repo pull-request page - faster loading due to pagination - enabled sorting of columns

pr: Rename update response flag `success` -> `executed` The name `success` may be misleading beacuse a skipped updated can be interpreted as success or failure. The new name `executed` is clearer because its only `True` if the update is really executed.

pr: Refactor PR update error message handling.