Add message for downloading which country

[cimentadaj]

Currently when downloading the rounds you only get output messages for which round you're downloading, such as

Downloading ESS2
  |=============================================================| 100%
Downloading ESS4
  |=============================================================| 100%
Downloading ESS8
  |=============================================================| 100%

When downloading many datasets from different countries it might be informative to also print the country being downloaded in case the download hangs, and it's easier to debug.