fixed an old bug relating to image proportions, still need to smooth things out a bit...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
now single image mode image block ratio transitions smoothly from square to viewer (need to revize)...

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

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

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
replaces constant resorting with careful positional insert for marks...

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

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

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