Feature request: normalize_efd function that also outputs angle and scale

[geloescht]

Thank you very much for this beautiful piece of software. For my purposes it would be great to also get the normalization angle and scale in order to store it alongside the descriptor for future lookups. Would it be possible to have a analogous function to normalize_efd that outputs those values and the normalized descriptor as a tuple?

[hbldh]

It would definitely be possible. The simplest way would be adding a keyword, like return_normalization_parameters=False and check if it is set to True before returning and in that case return coeffs, (coeffs[0, 0], psi_1, theta_1) instead.

You are very welcome to make a PR implementing this!