wc: add --total={auto,never,always,only} option

without this option, control of when the total is output
is quite awkward. Consider trying to suppress the total line,
which could be achieved with something like:

   wc-no-total() { wc "$@" /dev/null | head -n-2; }

As well as being non obvious, it's also non general.
It would give a non failure, but zero count if passed a file on stdin.
Also it doesn't work in conjunction with the --files0-from option,
which would need to be handled differently with something like:

   { find files -print0; printf '%s\0' /dev/null; } |
   wc --files0-from=- |
   head -n2

Also getting just the total can be awkward as file names
are only suppressed when processing stdin, and
also a total line is only printed if processing more than one file.
For completness this might be achieved currently with:

  wc-only-total() {
    wc "$@" |
    tail -n1 |
    sed 's/^ *//; s/ [^ 0-9]*$//'
  }

* src/wc.c: Add new --total option.
* tests/misc/wc-total.sh: New test suite for the new option.
* tests/local.mk: Reference the new test.
* doc/coreutils.texi (wc invocation): Document the new option.
* THANKS.in: Add suggestor.
* NEWS: Mention the new feature.

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