Integrated texinfo browser from QtOctave. * documentation-dockwidget.cc: Added new dock widget for the documentation. * documentation-dockwidget.h: Added new dock widget for the documentation. * bookmark.png: New icon file. * question.png: New icon file. * star.png: New icon file. * stop.png: New icon file. * zoom-in.png: New icon file. * zoom-out.png: New icon file. * parser.cc: Added file from QtOctave, refactored code. * parser.h: Added file from QtOctave, refactored code. * webinfo.cc: Added file from QtOctave, refactored code. * webinfo.h: Added file from QtOctave, refactored code. * main-window.cc: Added menu entries to handle documentation and integrated new documentation dock widget. * main-window.h: Including header for documentation dock widget and added member variable. * resource.qrc: Added icon entries for new icon files. * src.pro: Added file entries for new file added to the project.

--- a/gui/src/main-window.h
+++ b/gui/src/main-window.h
@@ -44,6 +44,7 @@
 #include "history-dockwidget.h"
 #include "files-dockwidget.h"
 #include "terminal-dockwidget.h"
+#include "documentation-dockwidget.h"
 #include "octave-qt-event-listener.h"
 #include "octave-event-observer.h"
 
@@ -104,6 +105,7 @@
   void focus_current_directory ();
   void focus_workspace ();
   void focus_editor ();
+  void focus_documentation ();
 
   void handle_entered_debug_mode ();
   void handle_quit_debug_mode ();
@@ -137,6 +139,7 @@
   history_dock_widget *     _history_dock_widget;
   files_dock_widget *       _files_dock_widget;
   terminal_dock_widget *    _terminal_dock_widget;
+  documentation_dock_widget*_documentation_dock_widget;
 
   // Toolbars.
   QStatusBar *              _status_bar;