This makes the setup run through quite a bit faster.  This is
interesting for the integration tests.

It is no longer mentioned anywhere in the current codebase (except
update70.py).

`dak rm` really wants it.

This should avoid errors on the second try when InRelease was already
removed.

Makes it easier to comment-out already done stuff...

This should make it a bit easier to comment out the part that already
run in case the script abort during the point release.

It looks up the archive from the ${suite} and that doesn't like the
codename.

For unstable dak adds the source package to the debug suite, but we
don't do that for testing (though dak will ensure the source is
present and keep it as an extra source in the Sources index).

This change makes sure to also remove obsolete debug packages that had
no source in the debug suite.

Every second counts!