replicate spell.cgi

The spell-checking functionality is a hardcoded call to spell.cgi on the local server - js.vi calls spell.cgi with GET arguments like this:

c35=Suite&c36=Boston

The script returns a text/plain document with suggestions in the body like so:

c35=Suite
c36=
c36=Boston
c36=Bostons
c36=boson
c36=Bolton
