LTI-Lib (C++ Computer Vision Library) Code

- _LTI_MSC_VER => _LTI_WIN32 for OS specific code, likewise for gcc vs. linux
- __linux__ => _LTI_LINUX obviously
- Lars hacked processInfo ASM to compile under gcc using Windows asm (working?)
- ltiMath.h now pulls isnan(), isinf(), and isfinite() in from namespace std for gcc>3 Some systems use other specs than linux where this is not needed.

Instructions for compiling the LTI-Lib with mingw will follow.