(svn r2606) -Codechange: renamed ai.c to ai_old.c, and ai.h to ai_new.h to make room
for a global AI-handler

(svn r1711) - Add: [MacOSX] Added an Xcode project file (Tobin)

This project file adds a graphical IDE to OSX, including graphical debugging, which is a bit easier than gdb (Xcode uses gdb for debugging)
Since it uses the makefile to compile, it should (hopefully) work without updating the project file when the makefile is updated
Tobin did most of the work, but I altered paths and settings for custom executable so it should work out of the box for everybody