Code review comment for ~waveform/ubuntu-dev-tools:built-before

Could you add some detail on what the intended use for this is?

Also, it needs a manpage...

And finally it doesn't seem to be using any existing u-d-t library stuff, i.e. it's not using *anything* under ubuntutools/, is there a reason for that? Like, why should this get added to u-d-t if it doesn't actually leverage any of the existing code in u-d-t?