Always make a backup before installing a new version.
Copy your entire BallroomDJ folder to another location.
On Mac OS X, copy your entire $HOME/Library/Application Support/BallroomDJ folder and
your $HOME/Desktop/BallroomDJ.app folder to another location.
- Updated the web server HTML to use a 'range' input instead of buttons.
- Added 'fail to start' tool for startup debugging.
- Fix error dialogs on startup.
- Windows: Add additional check to make sure python is executable.