Log Message:
Update to 2.0, requested in PR 21272.
Changes since 1.9:
Minor changes where newlines are printed.
Added check to warn about wiping out the originals with the -st option.
Fixed display of "flash used=no" for exif headers generated by photoshop.
Added -ci and -cs options.
Limit directory recursion depth to avoid crashing on circularly linked
directories within the Exif header.
Added automatic rottion (-autorotate) to right-up images that contain
a rotation tag from the camera.
*Finally* wrote a nice MAN page for jhead.