[PATCH] groups,id: add -0, --null option

[Bernhard Voelker]

The attached patch implements the -0,--null option for groups(1)
and id(1) as discussed in

  http://bugs.gnu.org/9987

and

  http://lists.gnu.org/archive/html/bug-coreutils/2011-11/msg00024.html

and as mentioned on Padraig's TODO list:

  http://www.pixelbeat.org/patches/coreutils/inbox_apr_2013.html
  TODO --> "group -0 to support group names with spaces etc."

A nit regarding the new test:
I was reluctant to use getent(1) to get a reasonable list of users.
Is that portable on all supported platforms?
Therefore, I've just used /etc/passwd.
Now as I'm writing this, I'm sure this will fail with NIS
where a "+" entry is used.  Can I use "getent passwd"?

Have a nice day,
Berny

groups-id-null.patch
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