Issue#53 fixed.
Cleanup unnecessary prints.
Issue #54 fixed
SameCameraChecker uses now the generic exif field checker.
Calling resetChecker for an empty composite image in the initial round
was missing. Having sequences
taken with more than one camera, it can cause trouble with identifying
the first image of a sequence if the camera serial number changes due to
the fact that the sequence is taken with different camera. AS the old
value in the SameCameraChecker is still stored, the checking fails. The
failure
branch calls the resetChecker, that reset all the field properly. Now
checkers are reset with the initial round of checker execution for empty
composite image.