[Vimperator] set guioptions +/-

[Fredrik Gustafsson]

Hello
First of all, thanks for a wonderful interface! A small feature that I
miss, because I switch between having and not having various guioptions
it would be very nice to if the + and - switched could be implemented.
Just like in Vim.

For example:
set guioptions=m
sets the guioptions to m
set guioptions=+t
sets the guioptions to mt
set guioptions=-m
sets the guioptions to t
set guioptions=m
sets the guioptions to m

and so on.

regards
iveqy
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