bugfix: fixed #3965 and updated a bunch of api tests which were not actually testing their return values properly

docs: create index for 4.X releases

bugfix: missing import

ini: Add fallback authentication plugin setting as comment to INI files.

pullrequest: disable pr on commits that dont share ancestor

logging: log the original error when a merge failure occurs

feature: Go To switcher now searches commit hashes as well

api: gracefully handle errors on repos that are damaged or missing from filesystem.

authn: Data migration for renaming 'container' to 'headers'. Rename the 'auth_plugins' setting and all 'auth_container_%s' settings.

authn: Renamed auth_container -> auth_headers