Promote aerialway stations & railway tram_stops and halts

[nvkelso]

• What did you see? I only see the station for aerialway and for tram_stops at zoom 15.
• What did you expect to see? I expect to see them earlier at zoom 13 in tiles. I might only show them with a symbol (no text part of the label) at zoom 13, but including them there shows the shape of the network. Similarly we're missing the calculated kind_tile_rank attribute on these.
• What map location are you having problems with? London, San Francisco, Berlin
• Screenshot? See below.

In functions.sql we're hard coding the zoom of these features to zoom 15:

            OR aerialway_val IN ('station')
            OR railway_val IN ('halt', 'tram_stop')
        THEN 15

There usually isn't an area associated with these (preventing the area scaling like with railway stations), so try adding them at zoom 13.

More complex, and probably a different ticket? If one of these is a "transfer" station where two lines come intersect (but not in a sequence running parallel), I could see zoom 12. And if it's the terminal station on the line then zoom 11.

[nvkelso]

Tile sync: Let's just do zoom 13 change now.

Depending on how these feels in tiles, we can revisit adding a tile_kind_rank to them later.

[nvkelso]

Overall good, but I see tram_stop features marked as min_zoom:11 in tiles which is too early. They should be zoom 13 instead.

In the PR I see this was zoom 13, but it was later set to 11 in 31d2c0e. I'm pretty sure 13 is what we want and looks best, but was there a reason for the zoom 11 change? See below...

[nvkelso]

It's probably because railway=halt, and railway=stop were requested to be at zoom 11 in another issue, but tram_stop at zoom 13 here? Split those two into different lines in the CSV? Scratch that – all of these should be at zoom 13. That's what OSM.org transit layer does, feels right in QA testing here.

[nvkelso]

aerialway=station is showing up at zoom 13 now, good:

[nvkelso]

railway=halt are showing up near Zug Switzerland now #12/47.1769/8.4923, QA pass:

[rmarianski]

@nvkelso yea, I saw in the description for #469 that tram_stops should be at z11. The pr above will move them to z13.

[nvkelso]

Verified.