Fix some bugs. Make server calls cancelable. Prompt for date in...

Fix some bugs. Make server calls cancelable. Prompt for date in lyskom-list-new-conferences when appropriate. Binary search on conference creation date. Cleanup.

Detailed changes:
> 2004-02-12  David Byers  <byers@lysator.liu.se>
>
> 	Make kom-list-new-conferences quittable:
> 	* commands2.el (lyskom-list-new-conferences): Handle C-g when
> 	listing conferences or persons using the new lyskom-cancel-calls.
>
> 	* internal.el (lyskom-cancel-calls): It works now.
>
> 2004-02-11  David Byers  <byers@lysator.liu.se>
>
> 	Improve ability to cancel calls:
> 	* services.el (initiate-get-text): Add lyskom-ref-no to PARSED.
> 	(initiate-get-text-stat): Ditto.
> 	(initiate-get-pers-stat): Ditto.
> 	(initiate-get-conf-stat): Ditto.
> 	(initiate-get-uconf-stat): Ditto.
> 	(initiate-get-static-session-info): Ditto.
> 	(initiate-get-stats-description): Ditto.
> 	(initiate-get-boottime-info): Ditto.
>
> 	* internal.el (lyskom-apply-handler): Allow ref-no in PARSED.
>
> 	* parse.el (lyskom-tr-call-to-parsed): Leave the ref-no in PARSED.
>
> 	* internal.el (lyskom-cancel-calls): New function.
>
> 	Prevent lyskom-ref-no from going negative:
> 	* macros.el (lyskom-ref-no): New macro to get and increment
> 	lyskom-ref-no.
>
> 	* internal.el (lyskom-send-packet): Ensure that lyskom-ref-no
> 	never goes negative.
>
> 	Fix bug 1272:
> 	* review.el (kom-review-converted): Don't bind
> 	lyskom-format-special (why did we *ever* bind it here?)
>
> 2004-02-09  David Byers  <byers@lysator.liu.se>
>
> 	* clienttypes.el (lyskom-queue-remove-matching): New function.
>
> 2004-02-07  David Byers  <byers@lysator.liu.se>
>
> 	* utilities.el (lyskom-read-date): Added optional parameter empty.
>
> 	Speed up behavior after changing user area:
> 	* async.el (lyskom-parse-async): Don't re-read settings if the new
> 	user area is one we've already read (or just created).
>
> 	* flags.el (lyskom-save-options-2): Set lyskom-current-user-area.
> 	(lyskom-read-options-eval): Ditto.
>
> 	Bug 1271 (and then some):
> 	* commands2.el (kom-list-new-conferences): Accept prefix arg to
> 	list from a specific date.
> 	(kom-list-new-persons): Ditto.
> 	(lyskom-list-new-conferences): Prompt for start date if the caller
> 	requests it or the command has never been used before.
>
> 2004-02-06  David Byers  <byers@lysator.liu.se>
>
> 	* utilities.el (lyskom-find-conf-by-date): New function.
>
1a65,67
>
> 	* macros.el (blocking-do-multiple): Use modern backquote syntax to
> 	make the code more readable.