Fixed issue in geltransformer that caused pixel values above 46340 to be squashed during linearization. (Commit includes a LOT of notes/comments.)
Fixed issue where rotating the gel would squash saturated pixels (pixels with values of 2**16-1). This may not be needed for Pillow.
Fixed issue where browsing for annotation/yaml file would give an error (absolute filepath vs relative to gelfile).
Fixed issue where bicubic filter during rotate caused squashed pixels. This commit includes a lot of debug notes that will be removed for next commit.