Log Message:
leptonica: updated to 1.79.0

1.79.0:
* Clean up auto-generation of files; removed 'register'
* Some fixes for issues identified by fuzzer
* New source files: checkerboard.c
* New programs: replacebytes.c, webpanimio_reg.c, partifytest.c,
  rectangle_reg.c, lowsat_reg.c, rotate_it.c, scale_it.c, dewarp_it.c,
  pdfio1_reg.c, pdfio2_reg.c, checkerboard_reg.c, underlinetest.c.
* Convert to standard reg test: heap_reg.c, pixa1_reg.c, smallpix_reg.c
* Improve data checking when reading image file headers
  (pnm, png, jpeg, tiff)
* Fix some bugs in pnm reading
* Fix inconsistencies with the encoding type flags in pdf writing
* Allow tiff to write images with colormaps
* Fix errors in PS code; made some functions static
* Add code for animated webp (requires webp mux and demux libraries)
* Add "partify" application for separating parts in a musical score
* Enable tif read/write of gray+alpha and rgba; filter out tiff
  pixels that are not uint and compression by tile
* Apply consistent formatting of static const variables
* Add programs for scaling, rotation and deskew, named dewkew_it,
  rotate_it and scale_it, for useful operations on arbitrary images.
* Convert pdfiotest program to two regression tests: pdfio1_reg
  and pdfio2_reg.
* Remove all use of strncat; use stringCat().
* New functions from removing outliers in sequences of boxes.
* Generalize pixAverageInRect(): mask, region and range filters,
  and subsampling.  New pixAverageInRectRGB().
* Fix int overflow bug in pixMedianCut(); required new heap accessor.
* New pixMultiplyGray() allows pix to be multiplied by an array (or
  another pix)
* Better routines for counting color.
* Lossless conversion for RGB to cmap with not more than 256 colors.
* New histo based global thresholding: pixThresholdByHisto().
* Allow most reg tests to run even if external libraries are not
  available.
* New one-line gplot functions that return a pix.
* New application to find where corners meet in a checkerboard.
* Add utility functions for painting through mask in cmap pix,
  creating a hit-miss sela from a color pix, equality of two pta.
* Proper handling of 1 bpp colormap tiffs: remove when reading,
  preserve when writing.
* Deprecate three pixSaveTile*() functions; removed all calls to
  these from the library and progs.
* Include auto_config.h explicitly in all src and prog files.
* Improve input data checking for bmp files.