More cleanup associated with removing Java dialog boxes (cset b5d9b95d1e1a). * NEWS: List errordlg only once in list of Java functions removed. * errordlg.m: Use a single sentence description of function for first documentation paragraph. Correct misspelling of "occurred". Match variable names in code to those in docstring. * helpdlg.m, warndlg.m: Use a single sentence description of function for first documentation paragraph. Match variable names in code to those in docstring. * inputdlg.m: Match variable names in code to those in docstring. Use function name as prefix to all error messages. Use spaces and line wrapping to make %!demos more readable. * listdlg.m: Re-order and rephrase some of docstring. Add more input validation. Add new BIST tests for input validation. * questdlg.m: Re-order some of docstring. Use function name as prefix to all error messages. Eliminate unreachable otherwise statement in switch block. Add new BIST tests for input validation.

To cite GNU Octave in publications use:

  John W. Eaton, David Bateman, Søren Hauberg, Rik Wehbring (2015).
  GNU Octave version 4.0.0 manual: a high-level interactive language for
  numerical computations.
  URL http://www.gnu.org/software/octave/doc/interpreter/

A BibTeX entry for LaTeX users is:

  @book{,
    author    = {John W. Eaton, David Bateman, S\oren Hauberg, and Rik Wehbring},
    title     = {{GNU Octave} version 4.0.0 manual: a high-level interactive language for numerical computations},
    year      = {2015},
    url       = {http://www.gnu.org/software/octave/doc/interpreter},
  }

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.