[Tile-serving] [osm2pgsql] unique ids - force (#446)

[ImreSamu]

@bvbever :  maybe you can check/modify  the code here:  
* https://github.com/openstreetmap/osm2pgsql/search?utf8=%E2%9C%93&q=Split+long+ways

And check ["-multi-geometry"  "-G"](https://github.com/openstreetmap/osm2pgsql/blob/master/docs/usage.md#output-data-options) parameter  , as pnorman wrote ...


Alternative  PostGIS solution : 
*  [ST_Union]  ( http://postgis.net/docs/ST_Union.html )



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https://github.com/openstreetmap/osm2pgsql/issues/446#issuecomment-137385754
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