GSGGR-209 Territory ownership and order limits

[lanseg]

There are two parameters that configure how the feature works:

1. MAX_ORDER_AREA environment variable. If the value is set to 0, then any user can order data for area of any square meters. Otherwise, user must either be a data owner for this area to make unlimited orders.
2. ProductOwnership that says what group owns the given area (e.g. local gemeinde owns the whole town). Owners can make unlimited queries to the area.
3. If requested area intersects owned and unowned areas, then unowned part should be less than MAX_ORDER_AREA

Possible extensions:
Use area quotas instead ownership, so it would be possible to define how many square kilometers of data can each user query from each area

[jwkaltz]

LGTM