[Fixed] A city that drops below rank 3 will now be unregistered
automatically
[Fixed] The maintenance cost for city registration will now be reflected
in the total line of the maintenance report and not just the city hall
line

Change-Id: I333d77adb9fd8f2a29fc0b1f3d1b7c4c3d6cf1dd
Merge "[Fixed] A city that drops below rank 3 will now be unregistered automatically [Fixed] The maintenance cost for city registration will now be reflected in the total line of the maintenance report and not just the city hall line" into unstable