Bugfix #5313

3D Window "Transform properties" was using bad globals for buttons, this
caused things not work with multiple 3d windows open, and (in editmode)
set one panel to "Local" and the other to "Global".

Also:
- added undo push for moving bone to a layer
- protected Ikey for posemode to not show a menu without selection

source/blender/src/poseobject.c

@@ -947,6 +947,7 @@ void pose_movetolayer(void)
 			}
 		}
 		
+		BIF_undo_push("Move Bone layer");
 		allqueue(REDRAWVIEW3D, 0);
 		allqueue(REDRAWACTION, 0);
 		allqueue(REDRAWBUTSEDIT, 0);