Cancel download request on CTRL-C

[sverhoeven]

When I kill a era5cli process then I have to go to https://cds.climate.copernicus.eu/cdsapp#!/yourrequests to delete the requests.

It would be nice if pressing CTRL-C would to that deleting for me.

[BSchilperoort]

The cdsapi does not support cancelling requests. Perhaps this will be different with the upcoming new version.