added quadquad intersector
flipping edge orientation
using watertight test for quadquad intersection
updates
updates
using standard BVH4 as hierarchy for subdiv-micropolygons
optimized micropoly-leaf intersection
optimizing loop over hit quad-quads, using bsf for fast iteration
simplified leaf generation
cleanups
Merge branch 'devel' of https://github.com/embree/embree into devel