* NEWS: newusers will behave more like useradd.

	* NEWS: newusers will behave more like useradd.
	* src/newusers.c: The user's ID must be found before the group ID
	to mimic useradd's behavior choices of UID and GID.
	* src/newusers.c: Reuse the generic find_new_uid() and
	find_new_gid() functions. This permits to respect the
	UID_MIN/UID_MAX and GID_MIN/GID_MAX variables, should
	* src/newusers.c: Check if the user or group exist using the
	external databases (with the libc getpwnam/getgrnam functions).
	Refuse to update an user which exist in an external database but
	does not exist in the local database.
	* src/newusers.c: Check the usernames and groupnames with
	check_user_name() and check_group_name()
	* src/newusers.c: Use isdigit() for readability.
	* src/newusers.c: Check if numerical IDs are valid (no remaining
	chars).

	* NEWS, src/newusers.c: Fix the support for the NONE crypt method.

	* src/newusers.c: Fix shadow group support (the list of admins was
	not defined; it is now set to an empty list).