Fixed the use of -parentLayoutItem which is deprecated.  Relaxed parentItem property access to use ivar when possible. This property is pretty  basic and not going to move away anytime. This makes the code a bit shorter here  and there, and might give us a small speed boost since parentItem is accessed very  often.
Fixed the use of -parentLayoutItem which is deprecated. 
Relaxed parentItem property access to use ivar when possible. This property is pretty 
basic and not going to move away anytime. This makes the code a bit shorter here 
and there, and might give us a small speed boost since parentItem is accessed very 
often.

git-svn-id: 0833b781a6984bca00fd44c5b8a33a6c879c84c9@4218 7b3f36aa-e6db-49c1-8b4c-66eac1997e64

etoile/EtoileUI,etoile/EtoileUI