fix [#34805] Bake action ignores parent motion

in fact this is more feature request.
add an option to bake a parented objects animation, then clear the parent and apply the action.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55954 954f8c5b-7b00-dc11-b283-0030488c597c