Options to cairo driver

[John Darrington]

In order to make the output window properly respond to changes
in style (eg. from gnome theme engines) we need to be able to
dynamically set options AFTER the driver has been created.

I thought this would be straightforward, but it seems not to be
the case, because the parse_font, parse_dimension routeines etc.
demand a default value, which has means it's not possible to set
an indivual option, without also setting all the other options
back to their default values.

I can see a couple of ways around this, but they all end up 
fighting against the "default-value".  It would seem better
to rethink the way src/output/options.c is done.  

Comments?


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