Vertical text in taskbar

[Javier Goday]

Hi, i made a small patch to show vertical text in the taskbar when the panel
is vertical.

Don't know if it is the right way or if is the awaited behavior, but anyway
here's the patch : http://pastebin.com/f49987b73

http://img156.imageshack.us/my.php?image=snapshot1jo1.png
http://img292.imageshack.us/my.php?image=snapshot2bl7.png

Cheers!
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