* DistUpgrade/forced_obsoletes.txt:
  - no longer needed, part of DistUpgrade.cfg now
* DistUpgrade/mirrors.txt, DistUpgrade/removal_blacklist.txt:
  - renamed for consitency
* DistUpgrade/DistUpgrade.cfg, DistUpgrade/DistUpgradeCache.py:
  - added "RemovalBlacklistFile" instead of hardcoding it 
* DistUpgrade/DistUpgradeConfigParser.py: 
  - added "datadir" to constructor
* DistUpgrade/DistUpgradeControler.py:
  - added datadir
* DistUpgrade/DistUpgradeView.py:
  - added "hideStep()" method
  - added STEP_PREPARE, STEP_MODIFY_SOURCES, STEP_FETCH_INSTALL, STEP_CLEANUP, STEP_REBOOT
* DistUpgrade/DistUpgradeViewGtk.py:
  - implemendted hideStep()
  - added datadir arguemnt for constructor
* dist-upgrade.py
  - run it with the "." as arguemnt for the config
* UpdateManager/UpdateManager.py:
  - if it can't be updated, ask about a dist-upgrade instead
* update-manager. 
  - added --dist-upgrade
* po/*.po
  - make update-po