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tiled_pyramid_to_image().

to use it.

Also added an overload of operator() for pyramid_down that takes just
a single image and downsamples it.

This is the dlib/image_processing/generic_image.h file.  Then I changed all the
image processing functions so that they use this interface.  All the changes
are very minor, but there are just a lot of them.

Any user code that was using array2d objects to represent images will still
work.  However, this change makes it so that users can use their own custom
image objects with dlib by simply implementing a few global functions for their
image object.

pyramid_down and you give it the downsampling amount as a template argument.

down routines be at least 10 pixels on each side.

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pyramids.  Not just grayscale ones.

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between different layers in an image pyramid.

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things so that they still make sense now that I'm letting pixels be signed
as well as unsigned.

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