* Use "Internal Error" instead of "Bad Gateway" as the surflet handler is not a
gateway.
* Thus, rename BAD-GATEWAY-ERROR-RESPONSE to BAD-SURFLET-ERROR-RESPONSE.
Move SESSION-ADJUST-TIMEOUT from SEND/SUSPEND to RESUME-URL where it belongs to.
Let SET-SESSION-DATA! raise an error, if the instance isn't alive anymore (instead of returning #t or #f).
Add small comment to RESET-SESSION-TABLE!
Remove unused variable in DELETE-CONTINUATION!
Remove superfluous FILE-NAME-NON-DIRECTORY from RESUME-URL, as RESUME-URL-IDS uses this anyway.
Small change in error message in MAKE-HTTP-RESPONSE.