adopted by many Linux distributions as well as FreeBSD ports:
o jpegtran: add "-perfect" switch:
Fail if there are non-transformable edge blocks.
o jpegtran: add "-crop" switch:
Crop to a rectangular subarea.
o jpegtran: correct EXIF handling.
o jpegexiforient: Get and set the Exif Orientation Tag.
o exifautotran: Transforms Exif files so that Orientation becomes 1.
Suggested by dzoe on #NetBSD IRCNet.
