port existing proofs to ssreflect 1.9.0
From the mathcomp 1.9.0 release notes: > removed Coq prelude hints plus_n_O plus_n_Sm mult_n_O mult_n_Sm, to > improve robustness of by ...; scripts may need to invoke addn0, > addnS, muln0 or mulnS explicitly where these hints were used > accidentally. => This patch makes these required fixes in Prosa. While at it, turn on CI for coq:dev and Coq 8.9 with two versions of ssreflect.
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