merge MontgomeryEquivalence into MontgomeryLadder #413

Job	Run time
docker-master	1h 38m 10s
test-standalone (master, dev, default)	1m 3s
publish-standalone-dry-run	20s
build-wasm-of-ocaml (master, 4.14.1)	4m 58s
build-js-of-ocaml (master, 4.11.1)	14m 40s
test-amd64	2h 21m 7s
standalone-haskell (master)	55m 32s
generated-files (master)	28m 20s
validate-docker-master	1m 34s
deploy-js-wasm-of-ocaml	0s
docker-check-all	4s
	5h 45m 48s

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