Removing Java dialog boxes. * scripts/gui/module.mk: removed message_dialog.m entry. * scripts/gui/private/message_dialog.m: merged code to msgbox. * scripts/gui/errordlg.m: function now redirects to msgbox. New tests. * scripts/gui/helpdlg.m: function now redirects to msgbox. New tests. * scripts/gui/warndlg.m: function now redirects to msgbox. New tests. * scripts/gui/msgbox.m: merged code from message_dialog. Stripped Java dialog boxes. New tests. * scripts/gui/inputdlg.m: stripped Java dialog boxes. Improved doc. New tests. * scripts/gui/listdlg.m: stripped Java dialog boxes. Improved doc. New tests. * scripts/gui/questdlg.m: stripped Java dialog boxes. Improved doc. New tests. * scripts/miscellaneous/menu.m: stripped Java dialog boxes. Improved doc. * scripts/java/module.mk: removed entries of deleted files. * scripts/java/org/octave/DlgListener.java: removed Java dialog box Listener. * scripts/java/org/octave/images/error.png: removed unused image. * scripts/java/org/octave/images/information.png: removed unused image. * scripts/java/org/octave/images/octave.png: removed unused image. * scripts/java/org/octave/images/question.png: removed unused image. * scripts/java/org/octave/images/warning.png: removed unused image. * scripts/java/org/octave/JDialogBox.java: removed Java dialog box class. * scripts/java/org/octave/TeXcode.java: removed class used by Java dialogs. * scripts/java/org/octave/TeXtranslator.java: removed class used by Java dialogs. * doc/module.mk: removed unused java images and java.txi. * doc/interpreter/java.txi: merged content as minor sections to following files. * doc/interpreter/bugs.txi: moved Java distinguish section here. * doc/interpreter/external.txi: moved Java Interface description here. * doc/interpreter/gui.txi: moved dialog box docstrings here. * doc/interpreter/octave.texi: corrected TOC. * doc/interpreter/java-images/image001.png: removed unused image. * doc/interpreter/java-images/image002.png: removed unused image. * doc/interpreter/java-images/image003.png: removed unused image. * doc/interpreter/java-images/image004.png: removed unused image. * doc/interpreter/java-images/image005.png: removed unused image. * doc/interpreter/java-images/image006.png: removed unused image. * doc/interpreter/java-images/image007.png: removed unused image. * doc/interpreter/java-images/image008.png: removed unused image. * doc/interpreter/java-images/image009.png: removed unused image. * NEWS: Announced changes.

--- a/scripts/gui/questdlg.m	Tue Apr 19 12:30:18 2016 +0200
+++ b/scripts/gui/questdlg.m	Tue Apr 19 15:27:19 2016 +0200
@@ -43,7 +43,18 @@
 ## If only two button captions, @var{btn1} and @var{btn2}, are specified the
 ## dialog will have only these two buttons.
 ##
-## @seealso{errordlg, helpdlg, inputdlg, listdlg, warndlg}
+## Examples:
+##
+## @example
+## @group
+## btn = questdlg ("Close Octave?", "Some fancy title", "Yes", "No", "No");
+## if (strcmp (btn, "Yes"))
+##   exit ();
+## endif
+## @end group
+## @end example
+##
+## @seealso{errordlg, helpdlg, inputdlg, listdlg, msgbox, warndlg}
 ## @end deftypefn
 
 function btn = questdlg (msg, title = "Question Dialog", varargin)
@@ -111,9 +122,6 @@
   if (__octave_link_enabled__ ())
     btn = __octave_link_question_dialog__ (msg, title, options{1}, options{2},
                                            options{3}, options{4});
-  elseif (__have_feature__ ("JAVA"))
-    btn = javaMethod ("questdlg", "org.octave.JDialogBox", msg,
-                      title, options);
   else
     error ("questdlg is not available in this version of Octave");
   endif
@@ -172,4 +180,3 @@
 %!     endif
 %!   endif
 %! endif
-