[openstreetmap/openstreetmap-website] GPX upload : zip file handling (#2137)

[Tom Hughes]

It took about seven hours but running gpsbabel with the simplify filter and an error limit of 1m reduced the 230Mb referenced in this ticket to 3Mb - that's a reduction from 1.6 million points to 22 thousand points. Command line was:

```
gpsbabel -r -i gpx -f gps-data.44284.gpx -x simplify,error=0.001k -o gpx -F out.gpx
```

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