* on user creation, call out missing username/password separately from other errors
Merge pull request #527 from cgolubi1/245_user_creation_errors

* on user creation, call out missing username/password separately from other errors
* in the choose swing dialogue, show the opponent's swing die ranges too
Merge pull request #529 from cgolubi1/332_opponent_swing

* in the choose swing dialogue, show the opponent's swing die ranges too