* enable build on OpenBSD
* removed leading newlines from .map files
* removed unused tile descriptor in urban.ump
* map [+village] update

* removed some tiles that are either unused or do not fit the theme anymore
* added a basic dummy system (not fully functional yet)
* reworked most of the tiles to allow a better layout and integration of some static maps
* cleanup
* a minor fix in prefab of Bomber UFO
* removed worldspawn properties in village.ump - those were for testing only
Merge branch 'master' of git://github.com/ufoai/ufoai