Jam registration

[opatut]

Add oneself to the list of jammers. Only these will get more that the pre-jam announcement emails. No need to be registered to use the team finder.

By registering, each user gets a "team". This can consist of only the user himself, but may also contain other users.

One can create a team by inviting other people to the own team. They will be asked by email / notification. The invited user's team will be deleted when they accept the invitation (only if it was their auto-created team with only them as user), and re-created if they leave the team.

All users in a team can edit the game entry of the team.

Team joining is only possible until limit is reached.