[Tile-serving] [osm2pgsql] Add area reprojection facility (#454)

[Paul Norman]

> +    {
> +        if (*lat > 85.07)
> +            *lat = 85.07;
> +        if (*lat < -85.07)
> +            *lat = -85.07;
> +
> +        *lon = (*lon) * EARTH_CIRCUMFERENCE / 360.0;
> +        *lat = log(tan(M_PI/4.0 + (*lat) * DEG_TO_RAD / 2.0)) * EARTH_CIRCUMFERENCE/(M_PI*2);
> +        return;
> +    }
> +
> +    x[0] = *lon;
> +    y[0] = *lat;
> +    z[0] = 0;
> +
> +    /** end of "caution" section. */

Where's the start of the caution section? This might be refering to something in `reprojection::reproject`

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https://github.com/openstreetmap/osm2pgsql/pull/454/files#r41577902
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