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feat(data/finset,order/conditionally_complete_lattice): lemmas about …
…`min'/max'` (#8782) ## `data/finset/*` * add `finset.nonempty.to_set`; * add lemmas `finset.max'_lt_iff`, `finset.lt_min'_iff`, `finset.max'_eq_sup'`, `finset.min'_eq_inf'`; * rewrite `finset.induction_on_max` without using `finset.card`, move one step to `finset.lt_max'_of_mem_erase_max'`; ## `order/conditionally_complete_lattice` * add lemmas relating `Sup`/`Inf` of a nonempty finite set in a conditionally complete lattice to `finset.sup'`/`finset.inf'`/`finset.max'`/`finset.min'`; * a few more lemmas about `Sup`/`Inf` of a nonempty finite set in a conditionally complete lattice / linear order; ## `order/filter/at_top_bot` * golf the proof of `filter.high_scores`.
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