31 - keybinding display toggle

I have all my *assist* F-keys bound to the primary keys, while the target keys are all Alt-F-keys (I'm not a healer, so I don't really care about selecting a player, I just want to assist them). So, as a result, each groupmember's name is prefixed with Alt F1 Alt F2 etc, which looks really ugly to me.

So For now, I've been manually editing the addon's lua to disable the key name display, but it would be nice to have a pref for it!

- Cowboy