Misc cleanups to PathGroupoids, Equiv, HProp and BoundedSearch #3278

Job	Run time
build (supported)	3m 26s
nix	2m 21s
opam-build (supported, ubuntu-latest)	5m 10s
build (latest)	3m 24s
quick-build (supported, ubuntu-latest)	3m 20s
opam-build (latest, ubuntu-latest)	4m 33s
build (dev, --warnings)	3m 33s
quick-build (latest, ubuntu-latest)	3m 17s
opam-build (dev, ubuntu-latest)	7m 2s
quick-build (dev, ubuntu-latest)	3m 14s
doc-timing	1m 32s
doc-alectryon	15m 25s
doc-coqdoc	1m 30s
coqchk (supported)	2m 9s
doc-dep-graphs	7m 45s
coqchk (latest)	1m 58s
install (supported)	1m 33s
install (latest)	1m 31s
coqchk (dev)	1m 49s
install (dev)	1m 45s
deploy-doc	0s
delete-artifacts	7s
	1h 16m 24s

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