[Therion] Display Station comments on Map?

[Max D]

> On 3. Sep 2019, at 22:32, Bruce Mutton <bruce at tomo.co.nz> wrote:
> 
> Hmm, I have not time to look into this, don't really understand much about metapost at all, but my recollection is that I could get all the features implied in the code of the original p_station to manifest in outputs (at least of centrelines, if not scraps).  If you have removed code, then I suggest others look very carefully before this is committed.
> Although looking at your diff, it seem like you have taken little if anything out, so maybe my concern is unfounded?

This certainly should not be committed.

* I removed the "is this flag defined in this symbol set" check
* I also changed the calling convention for p_station 🙀

So this is definitively only Proof of Concept.

--max