Tow ship cannot capture player ship if player ship is completely stopped

[smcameron]

Towing services require a working impulse drive before we can be captured. After calling for services, you must move a little forward, otherwise the towship will circle the player's ship indefinitely.

[smcameron]

Tried verifiying this, set impulse to zero and called a tow ship. The tow ship arrived, claimed that it picked me up, and then sailed off without me. Trying to request another tow ship, it told me the tow ship was already en route. It also claimed the tow ship's name was "SB-02", which is the star base I had requested it from.

Edit: Several more attempts to verify failed (i.e. the tow ship worked correctly), so whatever the problem is, it doesn't happen every time.

[smcameron]

This should fix the problem that the already en route tow ship's name was not correct in the radio transmission from starbase.

dac77a3 Fix bug that already en route tow ship's name is wrong

[smcameron]

I don't think this fixes anything, but ...

94b9589 snis_server: Use set_object_location() in update_towed_ship()

I have so far only been able to reproduce(?) the problem (or a slightly different problem) once.

I did notice the tow ship flies weirdly sometimes, kind of rotating around more than you'd think it should, but that's a different problem.