Round management
----------------
+• Add a /round command which is identical to /hunt except that it acts
+ on only the puzzles in the same round(s) as the current puzzle.
+
• Select round fields by default based on the round of the puzzle for
the channel in which `/puzzle` is invoked.
Sheet-related fixes
-------------------
-• Have linked spreadsheets go into a specific Google Drive folder
+• Use a hunt-specific Google Drive folder for creating all the
+ sheets. (This way, we can share out the "mh2021" folder to all team
+ members so that people can browse the sheets that way if wanted, and
+ have backup access to all of them on the off chance of Slack not
+ being available.)
+
+• Question: Having "SOLVED" at the beginning of the sheet name is nice
+ for makint it noticeable with the sheet open, but it changes the
+ order of the sheet in the folder view. Do we maybe want to put
+ "SOLVED" at the end of the name so that puzzle sheets can be
+ reliably found in an ordered position regardless of solved status?
• Come up with a better sheet template