Rotation and Location don't have Keying Sets
Added Keying Sets for Delta Loc/Rot/Scale settings (aka dLoc/dRot).
These settings could already be found in the Object properties, under
the collapsed "Delta Transforms" panel.
I've added these to the end of the Keying Sets list, since adding any
earlier will end up breaking active Keying Set setting in older files.
Besides, these settings aren't that frequently used either...