make InvitationRequest form a Basic card+discussion

I changed its cardtype to Basic.  I think we may have this problem any time a *tform becomes something other than Basic, so we should probably look into that a bit further.

 

This one was especially challenging; I had to fix it through the console.  I had to change its extension type to user so that the before_delete on invitation type (which blocks the user) wouldn't explode.  Then I set the type to Basic by hand.

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tforms are locked Basic now - see the forms and cardtypes discussion.

  --John Abbe.....Thu Jul 24 14:10:44 -0700 2008