downloader must check file properties from server

[destan]

When we run app with -u parameter, it downloads all of the lists again. We need to compare creation date and file size with downloaded files and download file if server has newer version.

[destan]

you talked about inability to do this so would you update here as well pls?

[destan]

FTP protocol doesn't give last modified date but we can utilize filesize file for this purpose.