[Therion] Error visualisation data, drawing pdf

[Martin Sluka]

> 26. 2. 2017 v 6:55, Bruce Mutton via Therion <therion at speleo.sk>:
> 
> How have you hidden your walls Martin, such that they are ignored by the debug dots when hidden?

Simply I used scraps which have only point stations and nothing else. The very first test of data and possibility of misplaced or misnamed stations, duplicity, etc.

Martin s.
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