New shortcuts menu.

Hi,
I added a menu with two items acting as shortcuts to ROOT and HOME directories.

![Screenshot_2013-03-28-11-15-51](https://f.cloud.github.com/assets/2931982/312788/f116a72e-9792-11e2-9029-00c906737eaf.png)
![Screenshot_2013-03-28-11-16-08](https://f.cloud.github.com/assets/2931982/312789/f5c546cc-9792-11e2-8078-bfa8f3b3e6f5.png)