Merge branch 'unstable' into 'master'

Conflicts:
	Makefile
	README
	cat_u.c
	chmod.c
	chmod_u.c
	chown_u.c
	cmp.c
	cmp_u.c
	config/tools.h
	config/wcedef.h
	date.c
	date_u.c
	dd.c
	dd_u.c
	defmain.sh
	df.c
	df_u.c
	du.c
	du_u.c
	getevent_u.c
	hd.c
	hd_u.c
	ls_u.c
	maclib/Makefile
	maclib/libcrypto.dylib
	md5.c
	md5_u.c
	mtd.h
	nt.mk
	posix-io-for-windows/Makefile
	posix-io-for-windows/creat.c
	posix-io-for-windows/lseek.c
	r.c
	r_u.c
	setconsole_u.c
	timefunc.h
	toolbox.c
	touch.c
	touch_u.c
	uptime.c
	uptime_u.c
	wcelib/c.dll