minor changes to outliner
- linking groups into a scene now uses the objects original layers (some users have the layers set to useful values, so overwriting isnt so nice).
- dropping objects into the 3d view would make them active but not selected, a valid but confusing state, since most tools activate and select now objects.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54903 954f8c5b-7b00-dc11-b283-0030488c597c