Show boot time and basic server statistics in standard status display.

Make kom-extended-status-information more fine-grained, so we can have
extended information on the server but not on confs (and so forth).
Cache boot-time and static server information.

Detailed changes:
> 	Show more stats in non-extended display:
> 	* commands2.el (kom-status-server): Show text, conf and person
> 	statistics in the default display.
>
> 	Cace get-stats-description:
> 	* services.el (initiate-get-stats-description): Use cache.
>
> 	* vars.el.in (lyskom-stats-description): New variable.
>
> 	* parse.el (lyskom-parse-stats-description): Cache result.
>
> 	Show some boottime info:
> 	* commands2.el (kom-status-server): Show server start time and
> 	soem basic statistics in the default display.
>
> 	Cache static-server-info:
> 	* parse.el (lyskom-parse-static-server-info): Update cache.
>
> 	* services.el (initiate-get-boottime-info): Use cache.
>
> 	More fine-grained control over extended status:
> 	* commands2.el (kom-status-server): Only show full server stats if
> 	the appropriate extended status information is on.
>
> 	* utilities.el (lyskom-extended-status-information): New function.
>
> 	* commands2.el (kom-status-conf): Set
> 	kom-extended-status-information to t on entry if it contains conf.
> 	(kom-status-server): Set kom-extended-status-information to t on
> 	entry if it contains server.
> 	(kom-status-person): Set kom-extended-status-information to t on
> 	entry if it contains pers.
>
> 	* aux-items.el (lyskom-print-elisp-client-read-faq): Use
> 	lyskom-extended-status-information to check for extended status
> 	information.
>
> 	* vars.el.in (kom-extended-status-information): Updated variable
> 	documentation.
>