update to 5.13.0

changes:
  Backwards-incompatible changes:
* unstore, fassave, restore: cut out undocumented functions
  New items in core:
* unique: function to return unique elements of a list
* New function float_approx_equal w/ associated global
  variable float_approx_equal_tolerance (for test suite cases)
* Interface to Lisp string streams: make_string_input_stream,
  make_string_output_stream, get_output_stream_string
  New items in share:
* vector3d package (thanks to Walter Eastes)
* Script share/share_testsuite.mac to run tests in share
* share/contrib/topoly.lisp: new functions elim and elim_allbut
  New items in tests:
* Commit test scripts written by Michael Wester
  Other revisions:
* run_testsuite: only simplify expected results, do not evaluate, and
  do not call ratsimp; now tests are more stringent than before
* equal: recognize Maxima and Lisp arrays and Maxima and Lisp strings
* find_root: evaluate arguments in an ordinary way
* apply, outermap: evaluate arguments in an ordinary way
* save, loadfile, tex, stringout, compfile: evaluate filename argument
* display code: output space characters (no tabs)
* share/linearalgebra: improved jacobian and hessian functions
* share/contrib/lsquares.mac: replaced with a new version
* share/draw: include geographical data from World Boundaries Database;
  other modifications
* with_stdout: accepts an output stream as well as a filename
* share/contrib/topoly.lisp: many improvements in to_poly
* share/contrib/numericalio: accept stream as well as a filename
* many other minor improvements

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