This looks like it was just a typo. We want to join as late as possible
to allow flights coming from other airfields to take the best route to
the target that is safe, rather than joining as early as possible, which
isn't useful since pre-join and post-split are supposed to be safe areas
anyway.
This is briefly moving us over to my fork of pydcs while we wait for
https://github.com/pydcs/dcs/pull/206 to be merged. The adaptation is
invasive enough that I don't want it lingering for long.
It's rare with the current 5NM buffer around the origin, but if we use
the hold distance as the buffer like we maybe should it's possible for
the preferred join locations to fall entirely within the home zone. In
that case, fall back to a location within the max-turn-zone that's
outside the home zone and is nearest the IP.
