Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2018-09-03 16:58 956398c7

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refactor(tactic/interactive): improve error reporting for simpa also make simpa fail on no goals or when applied where simp will work

Estimated changes

modified theorem rat.denom_neg_eq_denom
modified theorem rat.num_denom_mk
modified theorem rat.num_zero