Update xsane to 0.30

Notable changes are:
 * Filename for saving/loading device settings can be specified.
 * improved calculation of auto enhancement values
 * Enhancement options (gamma, contrast, brightness, rgb default
   and negative) are saved as device settings.
 * Auto enhancement and pipette functions calculate enhancement
   values for each color now.
 * Options rgb default and negative are added to preferences.
 * pipette functions: middle mouse button defines shadow/gray/highlight
   for color components, left mouse button only defines gray values!

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