Hack build system
Include QtSingleApplication from the Qt Solutions component by Digia Plc
Only allow one instance of the application
Show the file modified dialog only once
Fix error messages when loading or saving of files fails
Code cleanup
Allow the file loader and saver to access CSVFile's updateFileInfo() only
Header file cleanup
Change key binding on global editor: Leave it with just <Enter>
Fix: Show the file modified dialog only once
Show navigation infos (current position and selection)
Change background color of global editor
Code cleanup
Set version to 1.6