replace Plane with axis-aligned Box (because infinite Plane is not usable with kd-tree)
fix memory leak in KdTree::nearest_intersection
rename BBox::R to BBox::H
new file: common.h (Eps and Inf constants)
================== Pyrit Ray Tracer==================License-------Currently unlicensed, you may not redistribute or use this work for any purposes.Will be MIT licensed when ready.Pthreads--------Threads can be used to render rows of picture paralelly. Arbitrary numberof threads can be used, even numbers like 17 are acceptable.To completely disable this feature just remove "-DPTHREADS -pthreads"from flags in makefile.For Windows + Mingw32, get pthreads library here:http://sources.redhat.com/pthreads-win32/