THE OBJECT PROXY
Or simple said; local control of referenced data from libraries.
Having library files with references is a very common studio setup, and
Blender did do quite well in that area. Were it not that for character
setups it was impossible to use still.
This commit will enable a full rig+character to remain in the library,
and still have - under strict control - local access for animation edits.
Full log:
http://www.blender3d.org/cms/Proxy_Objects.824.0.html