Bug 5509 - remove \!important from css rules.

Added tag v4.13.3 for changeset 7dc62c090881

release: Finish preparation for 4.13.3

release: updated pip2nix output for 4.13.3

release: Start preparation for 4.13.3

docs: added release 4.13.3 docs

docs: fix release dates

webhook: handle ${commit_id} variable independent from ${branch}. - in some cases we want non-branched individual commits to be posted.

vcs: use a real two part name for merge operation. - expose settings into vcs_settings for easier override later

users: in case of multiple personal groups, return the first instead of an error. - backward compat fix from previous error we had