* [ABI break] merge support for http redirects, thanks to

* [ABI break] merge support for http redirects, thanks to
  Jeff Licquia and Anthony Towns
* [ABI break] use int for the package IDs (thanks to Steve Cotton)
  - Galician updated. Closes: #509151
  - Catalan updated. Closes: #509375
  - Vietnamese updated. Closes: #509422
  - Traditional Chinese added. Closes: #510664
* COPYING:
  - Actualized. Removed obsolete Qt section, added GPLv2 clause.
    (Closes: #440049, #509337)
* Clarify the --help for 'purge' (LP: #243948)