Start improving control over type class search in proof mode tactics.
We do this in two ways: - Use `notypeclasses refine` instead of `eapply`, to avoid type class search being called arbitrary. - Use `typeclasses eauto` instead of `apply _`, to avoid type class search being called on unrelated evars. I mainly tried this for `iSpecialize` and friends; this same remains to be done for all other tactics. This commit also makes partial progress w.r.t. issue #135.
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