.gitignore
	jwack jobserver
		make compatibility
		sockety interface
	sqlite .redo database?
	rename --ifchange/--ifcreate to separate programs
	rewrite ifchange/ifcreate in C
	always update database atomically?
	find the right .repo dir automatically
	cd into subdir automatically
	'redo clean' should work
	aggressively mark stuff as done in the .redo database