[Therion] fixed point std error causes extreme survey network distortion

[Olly Betts]

On Tue, Jan 07, 2014 at 01:27:54PM +0000, Footleg wrote:
> Pulling this post from the Therion list, I just tried to find out what this
> option was in the Survex documentation, and it does not appear to be
> included in the cavern.htm help page (Survex 1.2.8 on Windows).

Yeah, Wookey also pointed that out a few weeks ago.  It's currently only
documented in the output of "cavern --help".  I've added it to the main
documentation and the man page now.

Cheers,
    Olly