fixed several small bugs in expandRibbon(..)

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
added "this and above" crop mode and a crop dialog...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
enabled intersecting ribbon crop modes...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
started work on an alternative partial ribbon loader (loadeImagesAround(...) and friends) -- already working but not connected...

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