rename evaluate_for_q -> formfactor

Doc/FFCatalog/fig/ff2/bornplot.py

@@ -142,7 +142,7 @@ def run_simulation(det, ff, trafo=None):
     :param trafo: Optional rotation
     """
     zero = ba.C3(0, 0, 0)
-    volume = abs(ff.evaluate_for_q(zero))
+    volume = abs(ff.formfactor(zero))
     print("Volume: %g" % volume)
     sample = get_sample(ff, trafo)
     beam = ba.Beam(1, 1*angstrom, ba.Direction(1e-8*deg, 0))