Give better error message when genome can't be downloaded (give full path)
Give better error message when genome can't be downloaded (give full path)

igvteam/igv,itenente/igv,itenente/igv,godotgildor/igv,godotgildor/igv,itenente/igv,amwenger/igv,igvteam/igv,godotgildor/igv,godotgildor/igv,igvteam/igv,godotgildor/igv,igvteam/igv,amwenger/igv,amwenger/igv,itenente/igv,amwenger/igv,amwenger/igv,itenente/igv,igvteam/igv