Add support for .7z file extensions.

version 0.18 - detect the login redirections on the new-look developer site Added additional debug information for incomplete transfers and login failures.

Extend packagelist parsing to read "sources.csv" files.

version 0.17 - use the size information in release_metadata.xml, treat checksum errors as failures Give a clear statement of success or failure after all the unzipping (if any) is completed This version will also resume any interrupted transfers (unless you say --noresume) based on the file sizes.