Blender Git Loki

Removed the extra ntree->update flag check in lib_verify_nodetree in readfile.c. This is unnecessary as the update flag will be checked internally in ntreeUpdateTree anyway, except for the generic bNodeTreeType->update callback (it could even be harmful by preventing necessary updates that don't use the ntree->update flag). Executing this once after loading a node tree is a useful feature for pynodes, so they can do initial verification.