Ability to invite all members of a group

[aleman]

It would be an excellent improvement to add the chance to make group invitation, about invitations-only tournaments.

Our group consists of about 50 people and we often do tournaments between us. Whenever you need to send about 50 invitations, and that's not very comfortable.

[Jest Phulin]

Single tables can be restricted to members of a certain group. Perhaps this functionality could be extended to tournaments? So, instead of Everyone or Invites being the choices, it could be Everyone/Invites/Members of group XYZ.