solaar-cli: fix regression in argument parsing

When no hidraw device is given, `solaar-cli` crashes because `None` is being
indirected. Use the correct action (`store`) to avoid indirecting a list.
devices.md: add reprog keys to feature list, K360
devices/k360: ltunify+solaar-cli output of k360+receiver
Merge pull request #57 from Lekensteyn/fixes

K360 docs, Improved solaar-cli argparse fix