[Tile-serving] [osm2pgsql] Make more of osm2pgsql threading aware (#110)

[apmon]

>      }
>  
> -    return 0;
> +    return ctx;
>  #else
>      fprintf(stderr,"Error: Could not init lua tag transform, as lua support was not compiled into this version\n");
>      return 1;

No, I think this is correct.

If everything goes through correctly with the initialisation, it passes back a pointer to the LUA thread context which can then be used in consequent functions to safely interact with the lua interpreter in a thread safe manor, as there is a different initialised context per thread.

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