Log Message:
Update to 5.9.1:

- 5.9.1 | 2013-10-04

  - bugfixes

    - specify ‘diff --binary’ consistently for non-POSIX systems

      On non-POSIX systems, in some cases, ‘rcs frob’ used to omit
      ‘--binary’ from the command-line to the underlying diff(1).
      Now, that is done in all cases.

    - portability fixes

      - avoid ‘grep -q’

        GNU grep understands ‘grep -q’ but some others do not.

         (info "(autoconf) Limitations of Usual Tools")

      - avoid ‘$<’ in makefile

        GNU make understands ‘$<’ but some others do not.

         (info "(autoconf) $< in Ordinary Make Rules")

      - avoid backslash in backticks

        The /bin/sh scripts used in "make" and "make check" \ 
now avoid
        using a backslash in backticks, which can cause problems for
        Solaris 9 /bin/sh (and maybe other /bin/sh implementations).

  - ‘PROGRAM --help’ shows home page / "gethelp" info

    This is for compliance w/ the GNU coding standards.

     (info "(standards) --help")

  - maintenance tools updated
    - automake (GNU automake) 1.13.4
    - gnulib-tool (GNU gnulib 2013-10-03 04:59:38) 0.0.8036-28df8