A way for a single user to test otext messages while building

[erkyrath]

Maybe a flag on the conn structure which indicates "include the player in others lists"? But we'd rather have a special prefix, so we'll probably have to special-case this.

[erkyrath]

The guest accounts are a halfway-adequate way to manage this. (You can safely give a guest account a link to your in-development Age. The guest's linking booklet is wiped for each new sign-in.)