Compact toolbar for minimal mode

Hi,

I felt this modification to the Larry skin would improve the compact minimal mode. It allows the user to see an extra two lines of emails in the email list. The style reflects the other UI elements such as the listbox and search box on the right of the toolbar.

The compact toolbar has been tested in IE7-10, Firefox, Opera, Chrome and Safari.

![cube-minimal](https://f.cloud.github.com/assets/505515/298113/e5ae8740-9552-11e2-84ed-15e4a13e36cd.png)

I know this could be done as an alternate skin but I felt it brought value to the default distribution.

Also, this would address a small Trac ticket #[1489009](http://trac.roundcube.net/ticket/1489009).

I did group all the minimal mode CSS at the bottom. I know this is kind of a personal choice but I felt it made it easier to understand what tweaks are applied when in minimal view.

Cheers,
Yves