Blender Git Loki

Bugfix [#27452] Wrong linking of character groups

Linking in groups also ended up adding those objects to the current
scene that we're linking the group in to. This is a regression. It
leads to more work (and/or confusion) from animators when just trying
to get a character into a shot file to start animating it (see my
notes on my blog for the proper workflow regarding this).

Reverting r36762, which caused this mess.