UFO:Alien Invasion Code

* base/models *.png files crush.

* crushed png files

* Fixed herakles_int texture (bottom of the opened ramp/door is now black)

* Further reduced filesize for herakles_int.png model texture by removing redundant texture parts and compressing/optimizing the file with pngout afterwards (a small part of the recently optimized texture was still redundant)

* Reduced filesize for herakles_int.png model texture by removing redundant texture parts and compressing/optimizing the file with pngout afterwards

* removed alpha channel

* recompress images with pngcrush, with gains varying from very small to 28.3%

* moved into trunk

* converted to jpg
* fixed skin paths

* moved herakles models from data_source into trunk