repos: fix total downloaded size reporting for cached packages. (RhBug:1121184)
refactor: crypto: Key is a class, not an "info" dict.

It resembles class a lot more now.
crypto: fix importing rpmfusion keys. (RhBug:1133830)

Converting keys between integers and their hexadecimal representation there
and back was a bad idea.
refactor: crypto: drop the integer keyid representation altogether.

Rename Key's properties to better reflect their meaning, drop
misc.KeyIdToRPMVer.
base: does not reinstall pkgs from local rpms with install command (RhBug:1122617)
history: fixed wrong set operation (RhBug:1136223)