More outliner features;

- Made visualization of object hierarchy more clear with lines; this
  solves the sometimes confusing mix of 'children objects' and
  'linked data'.
- Enter editmode on click, also shows editing context buttons
- SHIFT+click on a item closes/opens all below that item
- Added constraints and Hooks (watch fun icon!)

Note; global undo doesnt restore former view for outliner... it does not
save the GUI, remember? :)

source/blender/include/BIF_resources.h

@@ -174,8 +174,8 @@ typedef enum {
 	ICON_DOWNARROW_HLT,
 	ICON_ROUNDBEVELTHING,
 	ICON_FULLTEXTURE,
-	ICON_REDPUBLISHERHALFTHINGY,
-	ICON_PUBLISHER,
+	ICON_HOOK,
+	ICON_DOT,
 	ICON_CKEY,
 	ICON_CHECKBOX_DEHLT,
 	ICON_CHECKBOX_HLT,