This rotation is different from the Rotate tool and the post-correction
adjustment rotation because it is applied between camera shift and
camera angle. It is equivalent to correcting the camera's roll and is
the same as the rotation calculated by automatic perspective correction.
darktable/ART searches for the optimal value of a parameter starting
with the currently set value. They scan within a range of that value.
This commit changes the starting value to 0 for rotation, pitch, and
yaw. It makes the search range balanced.
Comment out parameters that darktable/ART use in case we decide to use
them later. Add yaw and pitch parameters used by the camera-based
perspective correction. Modify homography matrix calculation to use the
camera-based perspective model.
