[Tile-serving] [openstreetmap/osm2pgsql] Allow propagating tags to ways during relations processing (#230)

[Kevin B Kenny]

Oh, one more note. Any solution that loses the association of the ordered pair (network, ref) is not acceptable.  Consider the area shown [here](https://kbk.is-a-geek.net/catskills/test4.html?la=40.2001&lo=-81.3342&z=12) All of those tertiary roads are tagged 'ref=CR NNN', and without the network, it's not possible to select the right marker. The markers in Guernsey and Belmont Counties are green-and-white squares. Those in Harrison County are white-and-black squares. Those in Tuscarawas County are blue-and-gold pentagons. 

Before anyone tells me that 'sure you can do it, "just" intersect the way with the multipolygons that give the county boundaries, let me observe that even if it were possible to do so with reasonable performance, it simply cannot work.  [Here](https://kbk.is-a-geek.net/catskills/test4.html?la=41.9987&lo=-76.5436&z=15) is a case where New York SR 17 dips into Pennsylania (while retaining its NY designation), and [here](https://kbk.is-a-geek.net/catskills/test4.html?la=41.0712&lo=-73.6982&z=15) is one where NY 120A runs mostly in Connecticut when it isn't following the state line.

This sort of thing isn't exactly ubiquitous, but it's not vanishingly rare, either. It's often done by informal agreement between the jurisdictions that maintain the roads, as to who takes responsibility for one or another road that goes between the jurisdictions. 

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