Reverted the changes from LensletArray

I reverted the changes, as apparently the code was not tested at all, and the main could not run. After trying to fix 2 errors #65 and #66  I got a even harder to debug error. To keep development going I created a branch from the current master, where all the WFS code is still in. (See branch issue66).

By cleaning the master, we go back to a working main function again.