Blender Git Loki

internal changes, script writers won't notice.
disable getattr metaclass forwarding attributes from the python class, eg:
bpy.types.Scene.foo != bpy.types.Scene.bl_rna.properties['foo']

... This was convenient but too tricky to properly maintain with attribute assignment and attributes defined within the class.
avoid doubles in dir() by converting to a set and then back to a list.