* 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.
