[PATCH] Increase #maxlength for geo_latlon input format

geo_latlon currently accepts lat/lon values up to 15 characters long, but there seems really no reason to limit it so much. PHP's "print" produces float values up to 16 chars long, and submitting such values to Geo fields in forms produces errors like "Longitude cannot be longer than 15 characters but is currently 16 characters long.". In practice, even longer values can be encountered, e.g. I am getting 18 characters lon/lat values submitted to me by a Java client.

Attached is a patch (against CSV HEAD) that changes the limit to 200 chars. This "should be enough for everyone".