TODO list
  - implement notice board (through UGC)
  - force a package to keep the current version
  - community repos: add repository handling on dependencies to avoid library breakages
  - External trigger: rewrite support and use bash
  - split entropy.py into entropy package
  - UGC: bug report documents?
  - UGC: ads documents/rotation support?
  - database backup tools
  - implement pdepend support in dependencies sorting
  - implement package sets (meta packages list)
  - use expiration as a base to have and handle multiple packages in repo?
  - add changelog to packages
  - documentation + man page
  - find a way to better handle real smartapps deps (need split PDEPEND?)
  - server-side: packages upload through socket?

  Spritz:
    - improve filters.py layout
    - Category <-> Image dictionary (for the properties menu)
    - allow package remasking?

Notes:
- when supporting more than one ":" in atoms, remember to fix treeupdates functions accordingly