Log Message:
Update to 0.4.7:

* 0.4.7 (21-02-2005)
  - fixed railroads being impassable
  - added single-step undo
  - added first mission of a tutorial campaign
  - triggering events can now obsolete other events
  - replaced broken 'nextmap' event with more versatile 'configure'
  - extended 'createunit' and 'research' events
  - added cf2bmp utility to create map images
  - updated Polish and Slovak translations

* 0.4.6 (18-01-2005)
  - added new maps 'Radio Silence' and 'Swords and Plowshares' (Yalwa
    campaign)
  - fixed crash related to mine sweepers
  - improved path finder resulting in much faster computer turns
  - updated Polish and added Slovak translation
  - added random terrain generation in CoMET
  - improved map scrolling in CoMET
  - rewrote stuff in tools/ so that no source files have to be touched for
    new languages/units/tiles anymore
  - various minor bugfixes