rm obsolete broken ff scripts

Examples/ff/SasCosineRipple.py

-#!/usr/bin/env python3
-"""
-Plot form factors.
-"""
-import bornagain as ba
-from bornagain import nm, deg
-import bornplot as bp
-
-det = ba.SphericalDetector(bp.simargs['n'], 5*deg, 2.5*deg, 2.5*deg)
-n = 4
-results = []
-for i in range(n):
-    omega = 90*i/(n - 1)
-    title = r'$\omega=%d^\circ$' % omega
-    ff = ba.CosineRipple(25*nm, 10*nm, 8*nm)
-    trafo = ba.RotationZ(omega*deg)
-    data = bp.run_simulation(det, ff, trafo)
-    results.append(bp.Result(data, title))
-
-bp.make_plot(results, det, "ff_CosineRipple")