Blender Git Loki

consolidate flags into a single enumeration

small comment correction

add update_all to integrator

encapsulate the need_update member of every manager

avoid repacking the data for unmodified objects

cleanup, remove Node::time_stamp

Merge branch 'master' into cycles_procedural_api

small cleanup

fix bits not being set in Node::tag_modified

fix regression making some tests fail

Merge branch 'master' into cycles_procedural_api

prepare ground for updating bvh arrays instead of recreating them

fix crashes with embree

avoid updating bvh data if no geometry has changed

still go through the geometry device update entirely even if no nodes are modified

add a parameter to control the maximum number of BVH refits

tweak GeometryManager update tagging

add some more flags for the ObjectManager

add flags to update tagging for light and shader managers

cleanup background update tagging