Log Message:
Update to 5.9.4:

- 5.9.4 | 2015-01-22

  - portability fix in "make check" for OSX

    We now avoid ‘head -N’, where N is a number, since that
    construct is not portable.  See:
    http://lists.gnu.org/archive/html/bug-rcs/2014-11/msg00000.html

  - doc improvements

    - index ‘rcs -o’ better

      It seems the term "outdate" is itself outdated, nowadays (sigh).
      This command is now indexed under "deleting" and \ 
"removing", as
      well as "outdating".

    - move ‘@cindex’ before ‘@item’ in tables

      The tables of substitution mode options and common options are
      now indexed such that selecting the indexed item in Emacs leaves
      point on the item's line and not the one after.

    - new index entries

      For concepts (locking, implicit checkout, branching-related
      stuff) and keywords.

    - introspective stuff moved into chapter "Hacking"

      These former chapters have been moved into chapter "Hacking":
      "File format", "Still missing", "Reporting \ 
bugs".  As a nice
      side-effect, the table of contents of the PDF now is one page.

    - ‘RCS_MEM_LIMIT’ on manpages updated

      RCS 5.9.2 (released 2013-11-28) changed how ‘RCS_MEM_LIMIT’
      works.  The Texinfo docs were updated but not the manpages.

  - maintenance tools

    upgraded:

     GNU Automake 1.15
     GNU gnulib 2015-01-20 09:09:03
     GNU texinfo 5.2

    as before:

     GNU Autoconf 2.69