Add export option: Edit in Level0

[saerdnaer]

I think it would be a nice way to edit filtered data by adding an edit in Level0 link next to the edit in JOSM link in the export dialog.

Bonus points if the query is automatically changed to the XML version with metadata:
set /osm-script/@output="xml" and set all print/@mode="meta" ;-)

[tyrasd]

nice idea!

But this would require that Level0 allows Overpass-API URLs (or completely generic URLs to OSM content) in its URL or ID-field. cc @Zverik

After that I could simply add a link to Level0 like http://level0.osmz.ru/index.php?url=http://overpass-api.de/api/interpreter?data=…, which would be totally equivalent to what the "export to JOSM" thing is currently doing.

[Zverik]

Overpass API links are now allowed for ?url= parameter. Only /interpreter?data=, no /xapi and such.

[tyrasd]

Nice. The export to Level0 is now implemented in the master (=dev.) branch. Demo available at http://overpass-turbo.eu/master/

[Zverik]

Great, thanks!