started working on panel serialization...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
bugfix in shiftMarkedImages(..) + performance inmprovement in updateImage(..) -- makes things like updateImages(..) ~15-20% faster in case we did not zoom...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>