Bug#908931: transition: gnat-8, Ada component of gcc-8

[Nicolas Boulenguez <nicolas@debian.org>]

The naive question at the end of the request was sincere.
What should I do exactly?

Should I rebuild and reupload each package manually?
Or prepare lines like:
  nmu adabrowse_4.0.3-9 . ANY . -m 'Reupload to unstable to complete the gnat-8 transition.'
  dw   music123_16.4-3  . ANY . -m 'gnat (>= 8)'
  dw      topal_78-1    . ANY . -m 'gnat (>= 8)'
Should I fill separate bugs for the removal of polyorb and spark?

Instructions at https://release.debian.org/wanna-build.html seem
contradictory.

  If the binNMUs are required by a transition, please check if there
  is an open bug for that transition in the release.debian.org
  pseudopackage, and if so request the binNMUs by following up on that
  bug report.
[...]
  If you're asking for binNMUs for a transition, you need not use this
  syntax, nor give a comprehensive list of packages: the Release Team
  has tools to auto-generate it, and will do so anyway. Just mention if
  any package should not be binNMUed for some reason.

  gb and dw are for failed builds only. Once a package has been built
  and added to the archive, use a binNMU to rebuild it.

Thanks.