This is the exact same patch as the 1.3.16+GG2 since it never made it into
the current cvs. It is just updated for 1.3.17. Go figure.

- Added the invite-key variable to eggdrop.conf.dist
- Made greet work for global +f users even if they
  didn't have a channel record. Keeps from having to set
  a channel rec for every channel when a user has global
  only flags.
- small 'if' syntax fix in msg_key