problem with inverse angstrom rings

[ercius]

I think the inverse Angstrom rings is off by a factor of two in this line:

DuSC_explorer/DuSC_explorer/__init__.py

Line 709 in abd9048

s = np.sin(theta) / self.wavelength

It should be 2 * np.sin(theta) / wavelength

This needs to be confirmed though.

[ercius]

Turns out s is defined without the factor of 2.

To be consistent with other program (like DM) we should consider changing this definition. DM uses 1/d which has the factor of 2 in it.