* module/web/server.scm (read-client): Fix number of returned values in
the case in which there is an error reading the client.
(sanitize-response): Add a case to adapt the reponse to the request
version.
(handle-request): Sanitize the response within an error-handling
block.
(serve-one-client): Move sanitation out of here.
* module/web/server/http.scm (keep-alive?): A more proper detection on
whether we should support persistent connections.
* module/web/response.scm (adapt-response-version): New routine, to
adapt a response to a given version. Currently a stub.
* module/web/server.scm: New generic web server module, with support for
different backends. An HTTP-over-TCP backend is the only one included
with Guile, though one can imagine FastCGI, mod-lisp, mongrel2/0mq etc
backends as well.
* module/web/server/http.scm: The aforementioned HTTP backend.
