Chai'etra Infinitus 1.1

A replacement for the original SDL port of Chai'etra Infinitus, submitted because the original has invalid file path information in the archive. This version also adds a new, external Chai'etra physics model which can be used with any unmerged maps. (If you've already downloaded the original SDL port, and you don't want the physics model by itself, don't bother with this - simply move the original to its proper location; there's no need to download 7 megs of new stuff just to fix a folder name. Get this one if you haven't downloaded it at all, though.)