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.

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