Revert "Revert #679 (#687)" #2601

Job	Run time
Check Style	4s
Check Documentation	51s
Check (stable)	7s
Test (stable)	5m 12s
Test (nightly)	11m 6s
Check (nightly)	1m 8s
Check no_std	30s
List directories for parallelizing tests	3s
Test assembly	5m 21s
Test (cp6_782/)	8s
Test (mnt4_753/)	44m 2s
Test (mnt6_753/)	11s
Test (./bw6_761)	2m 52s
Test (./ed_on_mnt4_298)	58s
Test (./ed_on_mnt4_753)	1m 31s
Test (./pallas)	1m 0s
Test (./bn254)	1m 50s
Test (./ed_on_cp6_782)	1m 12s
Test (./ed25519)	1m 3s
Test (./secq256k1)	53s
Test (./ed_on_bls12_381)	1m 11s
Test (./secp256k1)	57s
Test (./grumpkin)	1m 9s
Test (./bls12_377)	3m 28s
Test (./ed_on_bw6_761)	38s
Test (./curve25519)	1m 0s
Test (./mnt4_298)	2m 12s
Test (./bls12_381)	2m 50s
Test (./secp384r1)	1m 0s
Test (./mnt6_298)	3m 2s
Test (./bw6_767)	2m 55s
Test (./secp256r1)	56s
Test (./ed_on_bls12_377)	58s
Test (./ed_on_bls12_381_bandersnatch)	56s
Test (./ed_on_bn254)	1m 2s
Test (./vesta)	1m 1s
	1h 45m 17s

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