[openstreetmap/openstreetmap-website] Integrate the high-performance GPX importer (#1852)

[mmd]

Yes, I'm using gpx_import.rb for testing, which sort of works ok. I did some some minor tweaks to "Trace.find(:all,...", which somehow failed all the time.

Curiously, tile was always NULL, that why I even considered adding it in the code. So instead of calling  Quatile directly, I could also get the same done  via `tp.update_tile`. I just don't get any tile number by running Tracepoint.import alone:

```ruby
      tp = Tracepoint.new
      tp.lat = point.latitude
      tp.lon = point.longitude
      tp.altitude = point.altitude
      tp.timestamp = point.timestamp
      tp.gpx_id = id
      tp.trackid = point.segment
      tp.update_tile
      tps << tp
    end
```



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