Initial version. Production quality, fully complete source but contains known bugs (lots!)

BUGS

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+                                    -*-text-*-
+
+* If two users modify their crontabs simultaneously, there will be contention
+   for /var/cron/update between themselves and with the main daemon.
+
+* Daylight savings time shifts are not taken into account very well. If things
+   are critical, your best bet is to set your TZ environment variable to
+   `:Universal', and express all your configuration files in Universal
+   Coordinated Time (UTC).
+
+   
+* As often as not the cron daemon crashes (segfaults) when crontab sends it a
+   SIGHUP.