[Therion] BUG? Thin line in colour fill

[Andrew Atkinson]

Just been doing the final checks on my survey, and found a thin line
that should not be there in the colour file

see http://wotcc.org.uk/__Therion/ThinLineInFile.png generated by
http://wotcc.org.uk/__Therion/ThinLineinFileth2.png

A bit of investigation shows that the lower right station (1) of the
line is surface and the upper left is not surface (station 1.1)  not
sure if this is actually related as I needed a quick fix so.

Deleting them solves the problem, but that is not really a good solution

see http://wotcc.org.uk/__Therion/NoLine.png
and http://wotcc.org.uk/__Therion/NoLineth2.png

Therion 5.4.3 on Debian

Raw data is at
http://www.cave-registry.org.uk/svn/CheddarCatchment/Bagpit/Bagpit/

version 409 has the line it is fixed in version 410 (sorry the head is
only available on line, but the full data set is downloadable using an
svn client)

thanks

Andrew