ACL manager UI

Adds an UI to set object's ACL.
This UI only allows to set basics ACL (no groups) but is fully working.

![capture decran 2013-07-22 a 21 17 34](https://f.cloud.github.com/assets/57224/837295/6cc2f424-f303-11e2-9dcc-2cd23334d26a.png)