[Therion] Pb with LRUD on null length and vertical shots

[Stacho Mudrak]

> What I don't understand is:
> * why a horizontal shot of 1mm should be considered as vertical for
> displaying the LRUD?

When tyding up old post, I have chcecked this problem and it really is
a bug. I hope, I will be able to fix it.

> * why vertical shots are always oriented north even though a direction is
> given?

It is because of internal structure of data. This could be changed...

Regards, S.