Add lib/bytes.ml{,i} to the .gitignore
Use the safe_string ocamlbuild tag instead of giving it as parameter and simplify the scripting using a single shell script
Merge branch '4.02-warns' of https://github.com/herd/herdtools

Conflicts:
	gen/Makefile
	herd/Makefile
	lib/pre402.sh
	litmus/Makefile
	tools/Makefile