realtime_dragon demo: now fullsize model + octree
realtime_bunny demo: bigger resolution
Box, Sphere: implemented AABB intersection
new stop condition for octree building (when number of shapes in children >= 6x shapes in parent node)
fixes for octree traversal
octree traversal rewritten to avoid recursion
reenabled -O3 optimizations (was accidentaly disabled, now it traces even faster! :-))
realtime_bunny: added FPS counter, fixed a bug in ply loader
min3 and max3 templates added to common.h