* src/chage.c, src/chfn.c, src/chgpasswd.c, src/chpasswd.c,

	* src/chage.c, src/chfn.c, src/chgpasswd.c, src/chpasswd.c,
	src/chsh.c, src/groupadd.c, src/groupdel.c, src/groupmems.c,
	src/groupmod.c, src/newusers.c, src/useradd.c, src/userdel.c,
	src/usermod.c: Provide the PAM error
	message instead of our own, and log error to syslog.
	* src/groupmems.c: Exit with exit rather than fail_exit in usage().
	* src/newusers.c: Check the number of arguments.
	* src/newusers.c: Do not create the home directory when it is not
	changed.
	* src/useradd.c: Set the group password to "!" rather "x" if there
	are no gshadow file.