Alpha events are always misclassified as NR

[cfuselli]

The classifier function defined in here always gives nestid=0 for alpha events instead of 6.

This is because, with how the classifier is defined, the type with None, None, None, Ion gets selected.

As a quick fix, just setting

classifier = classifier[::-1]
solves the problem, as the classifier with three None is checked last.

(All the alpha events were then removed by epix because of the too high energy for a NR event)