We want other pieces of country information (in particular the short
names). This cleans up a lot of code anyway.
As an added bonus, this now catches squadrons that used invalid names
which would previously be passed through to pydcs and... then I don't
know what would happen.
This isn't actually the data that callers usually want. Most of the
callers just want the bounds. The heading and length are trivially
computed from that. Add a class to contain the result so it's easier to
refactor.
It replaces the FRONTLINE_LENGTH constant, which was used previously. The default setting for the frontline length has been set to match the FRONTLINE_LENGTH value (80 km), but I feel the default should be a bit shorter. Discussion on the topic would be welcome.
