iectl: download ældre versioner

Changelog
- 7130e75 Updated readme
- 7e92650 bsp: Added ssh command
- 6a9e403 bsp: we have rudimentary ssh-proxyjump support
- 488c891 ssh-proxyjump: Options that take no input does not need to return Option
- bcea1ed ssh-proxyjump: dont overwrite the previously read key when reading multiple identities from .ssh/
- ad3a5c1 ssh-proxyjump: minor readability improvements
- f02ad52 ssh: more space for panes - could not do 10 targets at once
- 0f5deaa ssh: support specified identity files (private keys)