[Tile-serving] [openstreetmap/osm2pgsql] Create primary keys (#1216)

[mboeringa]

>  **It is possible to configure it in a way that the `osm_id` column (or whatever you name it) is unique.** In which case you probably want to use that as your primary key column to save the overhead of an extra column.

@joto , do you mean by specifying all geometry columns as "multipolygon" so as to prevent having osm2pgsql break up OSM MultiPolygons into separate "polygon" objects?

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