merge #587 - move backup and nightly status checks to 3am in system time

previously these were run in a cron.daily script which per crontab is run at 6:25 am local time

management/daily_tasks.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+# This script is run daily (at 3am each night).
+
+# Take a backup.
+management/backup.py
+
+# Run status checks and email the administrator if anything changed.
+management/status_checks.py --show-changes --smtp