makefile: added outdated packages helper

release: Bump version 4.18.0 to 4.19.0

release: merge back stable branch into default

Added tag v4.18.3 for changeset f4cc6b3c5680

release: Finish preparation for 4.18.3

release: updated pip2nix output for 4.18.3

release: Start preparation for 4.18.3

git: use non-unicode author extraction as it's returned as bytes from backend, and we can get an unicode errors while there's some non-ascii characters.

svn: allow legacy (pre SVN 1.7) extraction of post commit data. - This allows pushing without errors, but limits integration functionality - Better don't raise exceptions here, to allow older systems to push - log.error about it to inform users.

mercurial: fixed lookup case of pure numeric refs.