basic implementation of extract_osm and adaptions to checkurl aswell as regions for impelenting new way of regions:
- cut osm data only with osmosis
- download elevation data prepared with the correct polygone already
adapted 'bim' so far that it also works for our own extracts (if the region file is already downloaded)
adapted error output in case region osm data hasn't been downloaded yet
Adopted Errorchecking in extract_osm and the new version of regions