Migrate to cv2. Add slow seeking capability.
larger default Hash size
Refact for cv and HDFStore.
minor refactor
Check that files exist before yielding frames.
Stopped in-place black/white inversion because that is troublesome when trying various params.
Remade unit tests. Not passing yet.
water tests pass
import tif reader
invert=False by default
curve splitting and wire code reorganization
tif file reader
Reoganize video modules and make dependencies optional.
h5 file ext