Rsync public datasets for visualization to stat1001

This change-set defines a directory on stat1, /a/public-datasets, that will
house world-readable datasets for visualization by limn. An hourly cron job on
stat1001 imports them to /var/www/public-datasets, owned by www-data and
nested under the apache docroot.

I did not use the 'cron_job' resource type because it is hard-set for daily
jobs owned by $misc::statistics::user::username.

Also adds '/a/eventlogging/archive' (forgot about that one) to stat1.

Change-Id: Ic65306056fd1d045c24f19d2835ec27fd0d6cda4