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f_equiv: slightly better support for function relations

Ralf Jung requested to merge ralf/f_equiv_ho into master

This makes f_equiv more powerful: with it we can solve goals of the form f x ≡ g x where f, g: X -d> OFE and f ≡ g. We still make no attempt at solving goals where the arguments are different. I think in all cases where this applies, it will finish the proof, so I added a solve.

I also added the testcases from d16ab1aa.

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