rawprepare: set IOP_TAG_DISTORT, implement distort_(,back}transform
rawprepare: scaling for raw mosaic buffers
rawprepare: scaling for floating point buffers
Deflicker (histogram of: source raw data): fix (crop + no scaling)
Disable "Create HDR": FIXME: this function needs adapting (cropping + scaling (B/W))
iop_dependencies.py: add rawprepare
Run iop_dependencies.py after merge!