Comment 9 for bug 2003259

Re-launched with the fixes asked for:

- Disussed the promotion needs on Mattermost, also with @seb128
- Checked all the package's situations with rmadison
- Updated the description text, checked for absence of words "probably" and "if" related to
  presence of anything in Main or Universe.
- Clearly marked at all appropriate points what needs to get promoted

Also found by failures of autopkgtests that there was a missing dependency of libcups2-dev in debian/tests/control in both libcupsfilters and libppd and an upstream bug which broke monochrome PCL-XL output in libcupsfilters. Uploaded libcupsfilters_2.0~b2-0ubuntu10 and libppd_2.0~b2-0ubuntu5. Also applied the fix to the upstream code, to be included in libcupsfilters 2.0~b3.