• Set-up an announcements Slack channel that's auto fed by email to a
particular email address.
+• Have Turbot explicitly report long state strings to the channel,
+ (since the implicit report from settting the abbreviated topic won't
+ have the whole message).
+
+• In messages (like from /solved) don't use a raw user_name value from
+ the request, but instead some tagged version of a user ID (which
+ Slack will render as a display name).
+
Round management
----------------
channel for a solved puzzle (but make sure archived puzzles still
show up in global hunt/round views).
+• Ensure that both spreadsheet and channel are updated in response to
+ any changes.
+
File uploads
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