DiffractionObject.scale_to() default is to scale to maxima

[sbillinge]

Problem

Sorry guys, this is a scope creep, but I had an a idea to make the scale_to() method more useful so that it can be run with no xvalue passed and still work by default.

Proposed solution

It would be something like this:

scaled_do = my_do.scaled_to(target_do)

and the default scaling would simply be max(target_do.on_q()[0])/max(my_do.on_q()[0])

if user passes in an xvalue, and xtype we go to the current workflow. This allows the user to override the default behavior when it doesn't work for some reason, for example they want to scale to a diffraction feature but there is small angle scattering in the signal, or the maximum peak in one pattern is a different peak or something.

[yucongalicechen]

I can take this issue!

[sbillinge]

I just saw an error, it should be on_q()[1], the y-array. Even better we can do it directly from the all_arrays[:,0]