Update xsane to 0.31

Notable changes are:
  * Experimental (not defined in the SANE standard) support for Automatic
    Document Feeder (scan until error) - should at least work with the
    umax-backend!
  * Changed standard device settings filename from scsi generic devicename
    to vendor:model.
  * The main window can be a fixed or a scrolled, resizable window now.
    Selection is done via setup/display/"main window fixed", the main
    window mode can be overwritten by specifying a command line option:

       -R or --Resizeable activates the resizeable, scrolled main window,
       -F or --Fixed activates the fixed (non resizable) main window.

  * Added option --device-settings file for definition of default device
    settings filename
  * Changed *_RGBI to *_RGBA to be compatible with coming extensions to
    the SANE standard

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