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Changes 1.2 -> 1.3:
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PhotoProc has faster preview.
Fixed some bugs, optimised some.
New tools pnmsharpness and comparesharpness.
Added hue-specific hue shifts.

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Changes 1.1 -> 1.2:
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PhotoProc is now exif rotation sensitive.
Proper window sizing, histogram, and pixel value display in PhotoProc.
New tool ppmlevels for traditional levels operations.
Highlight expansion function in ppmhsy.
Optimised pnmresample.
Better ppmtestimage.
ppmhsy now has better colour model: gamma correction + better Y value.

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Changes 1.0 -> 1.1:
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Added new tool pnmnormalise.
Improved PhotoProc: better UI, bugs fixed, faster.
Added hue-specific saturation and gamma in ppmhsy.
Some small bugfixes.
makephotoalbum can be fed jpegs directly and looks at exif rotation field.