Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-08-07 23:17 1e594c77

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chore(data/multiset/basic): move theorems around (#15882) This PR does the following:

  • move the singleton instance earlier (I want this defined before to_list for a subsequent PR)
  • move the order_bot instance earlier and minor golfs

Estimated changes