[Therion] Weird handling of directions

[Tarquin Wilton-Jones]

> If someone wants to help debug this, you can do conversion from grid to
> lat/long using Helmert here (note, use SH 00000.000000 00000.000000
> format with several decimal places to avoid it using the middle of a
> grid square):
> http://www.howtocreate.co.uk/php/gridref.php

ARGH!

I should take my own advice. Ignore me. I was never here.

(Therion is doing just fine. It has a 2-4 mm discrepancy, but I think
that is not something to worry about. Probably rounding errors
accumulating.)

Think I am going to crawl back into a hole.