some fixed in bvh4_builder2
trying to merge parallel binner of fast builder into new binner
removing mapping2
next step
removing bin_copy2
removing best2
removing duplicate binner
next step
next step
next step
extended priminfo with begin end range
separated CentGeomBounds3fa from PrimInfo
using priminfo
updates
removed split_left/right functions
cleanups in partition code
cleanups
Merge branch 'devel' of https://github.com/embree/embree into devel