mark symbols that should skip congruence axioms explicitly #511
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Re-do of #510, closes #509. Explicitly mark symbols as being skipped for congruence axioms where appropriate: i.e. not for inequality splitting, but for naming, Skolemisation, etc.
I believe general splitting can also skip congruence: one could imagine applying equality proxy before general splitting and the former would not affect the latter. Compare inequality splitting, where it does make a difference. I'm not 100% certain, so if you'd prefer to leave it in please say so.