[Therion] Exclude line parts in XVI export

[Martin Sluka]

> 29. 9. 2021 v 16:57, Torsten Schnitter <torsten.schnitter at netcologne.de>:
> 
> Of course you have to start at a well known station and also end at a well know station to connect the "new" survey correctly to the existing one.

As I wrote, divide your centreline to several centrelines in the same survey and comment-endcomment centreline of resurveied part.

And the new resurveied part is another survey, isn’t it.

Martin S.
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