Update xsane to 0.51

Changes are:

xsane-0.48 -> 0.49:
-------------------

 - added support for different x/y resolutions and zoom factors,
   the y-resolution slider is added to the xsane main dialog now
 - in gimp mode x- and y-resolution infos are set correct now
 - added resolution and zoom icons for x- and y-dimension
 - added fax_width and fax_height to preferences
 - added paper size frame in fax mode preview
 - added czech translation - thanks to by Stanislav Brabec
   <utx@k332.feld.cvut.cz>
 - changed gimp_install_procedure(...): "RGB, GRAY" -> 0
 - changed printer geometry setup from 1/72 ich to mm
 - added setup entries for fax- width, height, left_offset and
   bottom_offset
 - corrected terminating \0 of strings in sane_choose_device
 - when button "Negative" is pressed the white/gray/black points
   are also inverted
 - split preview_restore_image into preview_restore_image and
   preview_restore_image_from_file, it can zoom into a saved
   image now.
 - zoom functions are done now without a new preview scan.
   3 different zoom levels are stored.
 - in xsane_scan_start the output file is only opend once in
   multi pass scan three pass scan does work now again.
 - added several missing routines for gamma correction in three
   pass scan


xsane-0.49 -> 0.50:
-------------------

 - removed bug in calculation of paper size in copy and fax mode
 - added support for rotate image in xsane_save_ps
 - added support for rotate (landscape mode) in copy mode and
   save-ps mode and added preferences menu "Rotate Postscript"
 - added bugfix for gtk_tooltips_set_colors as long as it does
   not work in gtk
 - improved memory allocation routines and error handling in preview
 - after the main window is created the resolution, resolution_x
   and resolution_y are made up to date now
 - changed dynamic menue list definition in xsane_setup for
   TIFF_COMPRESSION menu


xsane-0.50 -> 0.51:
-------------------

 - added some rangechecks to histogram->gamma calculation
   it is done as histogram->gamma->histogram now
 - changed redraw frame in preview_display_partial_image(),
   now the old image is completely overpainted!
 - added xsane_set_all_resolutions() to xsane_printer_callback,
   now paper size frame is updated when printer is changed
 - corrected wrong error message in setting of scansource_selection
   from "unknown type" to "unknown constraint type"
 - moved xsane.header_size = 0; to the end of xsane_scan_done so
   it is called in each case the missing command was responsible
   for a segfault when starting a scan after xsane_cancel has
   been called
 - moved progress_bar from it's own window to the bottom of the
   main window progress_bar texts are displayed in info frame
   and in progress bar
 - added size in mm/cm/in to progress bar when not scanning
 - in scales the number of digits is defined by quantization now,
   if no quantization is given by backend (quant=0, SANE_TYPE_FIXED)
   x.2 digits are displayed
 - corrected page_setp for scales
 - selection_active is reset in preview_display_partial_image
   instead of preview_paint_image

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