Streamline reverse lookup slightly

[lonvia]

This saves an SQL query in two cases:

• When the reverse lookup points ends up being inside a building, don't do the interpolation lookup. We can't get a more precise address.
• When reverse lands on a street but an address was requested, a second lookup tries to find a closeby address for more precise localisation. However, the first SQL for finding the street already had looked up all the closeby location. So instead of sending a second SQL query, return all nearby places in the first query and do the address search from that.