Allows communication between the addon being run by group members. The addon won't advance until everyone has completed a step. Can optionally show quest tracking for the entire group.

A curse user suggested having a box with all party member names who had the addon, and have them turn green if they had completed the step, or red if they had not.

I thought I had found an easy way to do this:
http://wowprogramming.com/docs/events/UNIT_QUEST_LOG_CHANGED
But it seems unreliable to track party quest changes.

Yeah, we may need to have our addon communicate via the addon channel (gross).

Additional feature. |GRP| (maybe just |G|?) tags, including recommended group size. Warns user that the quest is a group quest, perhaps does not display the step if the user is not in a group. Could be manually disabled, or automatically disabled if they significantly out-level the guide.

A comment on how to implement the group mode feature - in game it looks like the default UI can see the quest leaderboards for nearby group members. So if we can figure out how to access that, it could remove the need for communication via the addon channel.