It is now possible to use the Outliner for managing the active action
of an ID-block (provided that it appears in the Outliner), which
should be a bit better than having to go through the NLA Editor.
So far, this only allowing unlinking actions, using some existing
operators. To use:
1) Navigate through the Outliner tree to find the
Object/Material/Lamp/etc. that the animation belongs to. (NOTE: this
doesn't work in Datablocks mode, but should in the normal "All Scenes"
and related modes)
2) Expand the "Animation" entry below this
3) Right-click on the Action entry below this, and select "Unlink"
from the RMB menu
In the process, I've fixed problems with some data-blocks not showing
their animation data in Outliner.
0b41c479e4