ver 3.9.3:

- Fix possible assertion with newer kernels on some hardware
- Port to BlueZ 5
- API documentation fixes

Send-To:
- Fix "Retry" button
- Set the From label as soon as we create the window
- Clear the progress bar text when there's an error
- Remove duplicate header label
- Show when all the transfers have completed

Wizard:
- Fix buttons when "retry" is clicked
- Only enable "PIN options" button if device is selected
- Hide PIN options dialogue if the selected device changes