Simplified descramble, use library routines instead
Made tests executable
Bugfix: forgot to add something here (?)
Bugfix: forgot to add something here (?)
Remove dead code
Improve fringe_cal, also allow CoG

Center of gravity should be more robust than finding the subpix maximum
by interpolating between 3 by 3 pixels.
Add test for embedding

numpy also has built-in zero padding. Compare with our lib
Add test for fringe_cal on real data
Add test for filter_sideband on real data
Remove restriction of r0,r1>0, added support for dtype