dist_points might better have type List for exclude

[juergenuhl]

I used a generator for the exluded suits (want to count length for 'good' suits with 3+ HCP only), which got 'eaten up' in the
first usage within dist_points and thus did not yield the expected result. I understand that the param doc says "a LIST..." but the
type is Iterable and that was the only place I had looked at.