Merge changes I698a1608,I9d66c41d,I3a4917a5,Id3d633ff,Id0dead30, ...

* changes:
  Let chown build standalone.
  sed bugfix: N or n at end of script would save the terminating NULL as the resume position, so the script would restart from beginning.
  sed s/// can have line continuations in the replacement part, with or without a \ escaping the newline.
  Promote printf.
  One more bugfix for printf.c, with test suite entry. (Make %-3d etc work.)
  Cleanup pass on printf.
  More half-finished cleanup of printf.c, and more test suite entries.
  Since "printf" is a shell builtin, printf.test wasn't actually testing anything.
  More printf cleanup, and test suite entries.