0.7.4.31:

0.7.4.31:
	mostly comment cleanups, but also a few slot renamings from my
		(unsuccessful so far) attempts to understand why a test
		case makes PROPAGATE-LIVE-TNS chew up 95% of compiler
		time...
	... s/global-conflicts-next/global-conflicts-next-blockwise/
	... s/global-conflicts-tn-next/global-conflicts-next-tnwise/
	... (i.e. making parallel-in-meaning slots parallel in name)