Changes to rate-area relation and rate calculation

The latest database SQL file includes METRO and the new ZONE areas.
CFS Rate table is reset once again to introduce "area_category" column.

For the new rate CSV format, a rate that covers metro areas must have
[METRO] in their origin_area or destination_area. (This was [METRO AREA]
before but I changed all of them already).

A rate that covers zone areas must have [ZONE_NAME] in their origin_area
or destination area (replace ZONE_NAME with the actual zone name e.g. ADL).