Issue66

Found only a bug in the main where centLensx/y must be an array instead of a list. When this was solved the mainWFS.py worked without any errors. Also included a test function and made some adjustments to the mainWFS.py regarding the number of samples the intensity distribution has.
I wouldn't import things from the main, although it is a personal thing I think. In your test functions you want to be able to "play around" with the parameters you have. To avoid changing the main during the tests, keep the test setup completely in this file.