message to stderr, exit with exit status != 0, and count on cron to
deliver the message to whoever should get it.

Kill lyskomd if etc/status exists.
Use ldifftime(), not difftime().

simple-cache.c should now use a lot less memory.
New format of the log file, including the pid.
Use ldifftime() instead of difftime().

(pre_sync): Destruct cache_nodes for deleted conferences, persons and
	texts (thus making exists_b obsolete).
(throwable_p): Non-existing nodes are throwable even if they are dirty.
(limit_conf, limit_pers, limit_text_stat): Throw all throwable
	objects, not just the first throwable object.
(save_one_conf, save_one_pers, save_one_text): The fact that the
	node exists can be used instead of the exists_b flag.

instead of difftime().

(initialize): Call go_daemon().

HH:MM:SS ").

Fixed spelling error.

(insert_mru): No longer public.