The static crontab files installed by base::cron have been replaced
with a template to handle differences between Red Hat and Debian.  The
periodic cron jobs no longer even attempt to use anacron, avoiding any
problems with unpredictable cron run times if anacron is installed on
the system.

base::cron::filter-user-noise has been deleted.  This was specific to
Research Computing systems and should be handled in that local
repository.

This is the (old) master branch along with the fixes to the
cron file permissions that Russ made.