Admin message

Self sign-up has been disabled due to increased spam activity. If you want to get access, please send an email to a project owner (preferred) or at gitlab(at)nic(dot)cz. We apologize for the inconvenience.

Add an option to make knotc zone-check exit with a non-zero status on warnings
Currently, `knotc zone-check` exits with `1` when it encounters an error. It would be nice to have an option that also makes it fail on warnings. I have also noticed that the man page doesn't mention the possible exit statuses of `knotc`.
issue