Invites should be fully public.

[zippy]

I think it's important to make the invitation process fully public (which it of course is internally, but we should make this visible).

So, maybe the group home page should have a membership page that shows:

• pending invitations and who made the invitation
• members and who sent them invitations (could be more than one person)

Also I noticed a bug in that I can send invitations multiple times. I think the DNA should not record a second invitation by me.

[matthme]

I was skimming through the We issues and saw this again. I think it conflicts with the idea to make invitations via seed words because in that case it would be completely opaque where someone got the invitation from. Any thoughts?