submission: reduce: new port submission

[mbrethen]

A new metaport has been created for reduce, a computer algebra system (CAS). It comprises the following sub-ports:

reduce-common: Installs the files that are independent of the Lisp system used. reduce-csl: Installs the Codemist Standard Lisp version of REDUCE. reduce-psl: Installs the Portable Standard Lisp version of REDUCE. reduce-addons: Useful addons for the REDUCE Computer Algebra System.

Issuing 'port install reduce' will install all four sub-ports. Otherwise, the user may install each sub-port as desired.

Note 1: A separate ticket will be issued to make the reduce-algebra port obsolete.

Note 2: This port uses svn for fetch since: 1)I work directly with developers to fix bugs on darwin platform and 2) Binary distributions are not released frequently (the last one was for snow-leopard).

Note 3: This submission addresses the following open tickets: #45299, #39483, #34895, #32973, #32648, #32595 and #32583