[Tile-serving] [osm2pgsql] use vectors of pointers in middle-ram to reduce memory footprint (#394)

[Paul Norman]

>      };
>  
> -    std::vector<std::vector<ramWay> > ways;
> -    std::vector<std::vector<ramRel> > rels;
> +    std::vector<std::unique_ptr<std::vector<std::unique_ptr<ramWay> > > > ways;

this is a vector of pointers to vectors of pointers to ways?

I'm wondering if it makes sense to typedef `std::vector<std::unique_ptr<ramWay> >` for clarity that it's a block of ways

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