academic/reduce-algebra: Added (portable computer algebra system).

Signed-off-by: David Spencer <idlemoor@slackbuilds.org>

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+REDUCE is an interactive system for general algebraic computations of
+interest to mathematicians, scientists and engineers.  It can be used
+interactively for simple calculations but also provides a flexible and
+expressive user programming language.
+
+The development of the REDUCE computer algebra system was started in the
+1960s by Anthony C. Hearn.  Since then, many scientists from all over the
+world have contributed to its development.  REDUCE has a long and
+distinguished place in the history of computer algebra systems.  Other
+systems that address some of the same issues but sometimes with rather
+different emphasis are Axiom, Derive, Macsyma (Maxima), Maple,
+Mathematica and MuPAD.
+
+REDUCE primarily runs on either Portable Standard Lisp (PSL) or Codemist
+Standard Lisp (CSL), both of which are included in the SourceForge
+distribution.  By modern standards, REDUCE is a surprisingly small and
+compact application, which runs well on all major operating systems.
+
+NOTE: TeX4ht (a part of the texlive package available at
+SlackBuilds.org) is used to build the REDUCE manual in HTML format.  It
+is not built if TeX4ht is not found on the system.  The manual in PDF
+format is built anyway.  The HTML manual is also available on the REDUCE
+homepage: http://reduce-algebra.sourceforge.net/manual/manual.html