maxima: switch from clisp to sbcl, enable tk gui, and fix various impurities
maxima: switch from clisp to sbcl, enable tk gui, and fix various impurities

 * Build maxima with sbcl for better performance.

 * Enable the regression test suite.

 * Configure $PATH at start-up so that maxima knows how to find sbcl,
   wish, rlwrap, and gnuplot.

 * Move installed documentation and Emacs lisp modules into standard
   locations.

 * Enable parallel building.

svn path=/nixpkgs/trunk/; revision=27743

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