perms.m: Cleanup for Octave coding conventions. * perms.m: Align @deftypefn macros in docstring. Use @qcode macro in docstrings for quoted options. Use newline before @example blocks to set off examples from rest of documentation text. Use strcmpi instead of isequal for better performance. Use single quotes to define strings which contain double quotes to simplify code. Use meaningful variable name 'n' instead of "tmp" to hold number of elements. Add semicolon after return statements. * perms.m (unique_perms): Renamed from "__perms_unique__". Change function prototype to accept second input "uniqv" to avoid calling unique() twice. Rename "uvec" to "uniqv" for clarity. Rename "ulen" to "n_uniq" for clarity. Cuddle parenthesis with variable when performing indexing per Octave convention. Rename "indx" to "idx" which is Octave conventional name for index. Use '!=" for not equal operator rather than '~=' which is Octave convention. Move input validation BIST tests to end of file.

To cite GNU Octave in publications use:

  John W. Eaton, David Bateman, Søren Hauberg, Rik Wehbring (2022).
  GNU Octave version 7.1.0 manual: a high-level interactive language for
  numerical computations.
  URL https://www.gnu.org/software/octave/doc/v7.1.0/

A BibTeX entry for LaTeX users is:

  @manual{,
    title     = {{GNU Octave} version 7.1.0 manual: a high-level interactive language for numerical computations},
    author    = {John W. Eaton and David Bateman and S{\o}ren Hauberg and Rik Wehbring},
    year      = {2022},
    url       = {https://www.gnu.org/software/octave/doc/v7.1.0/},
  }

We have invested a lot of time and effort in creating GNU Octave, please
cite it when using it.  See also 'citation pkgname' for citing Octave
packages.