A somewhat better implementation of referrers which no longer sends the referer if the URL schemes don't match.
Things to do:
1) Preservation of referer across redirects (see comment in browser.c:284)
2) GUI templates/code for configuration of referer sending (simple on/off toggle only)
3) Make referer sending when fetching objects/stylesheets for a page pay attention to option_send_referer?
4) Handle the case where the referer is in the form of http://moo:foo@mysite.com/ (ie the login details embedded in the referer - not good).
svn path=/import/netsurf/; revision=1297
Rework the interface of the URL handing module to allow for multiple error types.
Modify save_complete URL rewriting appropriately.
svn path=/import/netsurf/; revision=1206
