Added version id, so the compiler stops complaining.
Added a facility for automatically updating an archive.
Don't leave corrupt files lying around if downloading fails.
Developer feature: hold shift while pressing the 'Google Play' button to show the doc object.
HttpClient is probably not thread safe, so let's create a new one whenever one is requested. Also: let's not keep the network config in the credentials.cfg file.
Log files that were downloaded in the current session.