the new migration management in c8856f10 left...

the new migration management in c8856f10 left out the part where we actually keep the system's current MIGRATIONID... it was being lost when setup/start.sh was re-run

setup/start.sh

@@ -35,6 +35,10 @@ if [ -f /etc/mailinabox.conf ]; then
 	# Okay now load the old .conf file to get existing configuration options.
 	cat /etc/mailinabox.conf | sed s/^/DEFAULT_/ > /tmp/mailinabox.prev.conf
 	source /tmp/mailinabox.prev.conf
+	MIGRATIONID=$DEFAULT_MIGRATIONID
+else
+	# What migration are we at for new installs?
+	MIGRATIONID=1
 fi
 
 # The box needs a name.
@@ -171,6 +175,7 @@ PRIMARY_HOSTNAME=$PRIMARY_HOSTNAME
 PUBLIC_IP=$PUBLIC_IP
 PUBLIC_IPV6=$PUBLIC_IPV6
 CSR_COUNTRY=$CSR_COUNTRY
+MIGRATIONID=$MIGRATIONID
 EOF
 
 # Start service configuration.