flowplace

When we create/edit a circle, we want to offer the following options:

• Anyone can join: then players can automatically add themselves to a circle (there should then be an alert in the holoptiview saying something like 'John Doe joined the circle on 5 Jan. 2010 at 6:34pm')
• Apply to join: the user needs to apply for joining the circle
• By invitation only: user can't apply, only the namers/matrices of the circle can send those invitations to other players
• With a password: a user entering the right password can join the circle. This is useful in case we want to invite big number of people in a circle, just have to communicate a pw, and they just have to sign up

Joining a circle means joining core currencies in this circle.

Core currencies are defined by circle's namer. They are mandatory to anyone joining the circle.