option right now is the placement of the vertical scrollbars in the 3 panes.
(it's one decision; you can't have the placement of the vertical scrollbar
in the packet list pane different than the placement in the protocol tree
pane, for example).
I did this because I find it convenient to have the vertical scrollbars
on the *left* side of the text. My mouse cursor is usually expanding and
collapsing the protocol tree widgets, and once the protocol tree changes
size, I usually have to scroll. I'd rather move my mouse cursor just a few
pixels over to find the vertical scrollbar.
svn path=/trunk/; revision=1351
