images: Adjusted logo

There was a very tiny blue spot in the lower left. The blue background
was moved up very slightly to hide it behind the arrow areas.
controllers.flight: don't add non-encoded fixes to dict
import_airspaces: use geoalchemy2
import_airspaces: use argparse and allow updateing of specific counties only
import_airspaces: import single airspace file from url or file
airspaces_list.txt: update airspace list