FIX: property driven argsort_index and use flatcount
FIX: property driven argsort_index and use flatcount

scikit-xray/scikit-xray,danielballan/scikit-xray,tacaswell/scikit-beam,tacaswell/scikit-xray,tacaswell/scikit-beam,Nikea/scikit-xray,Nikea/scikit-xray,tacaswell/scikit-beam,scikit-xray/scikit-xray,tacaswell/scikit-xray,Nikea/scikit-xray,scikit-xray/scikit-xray,danielballan/scikit-xray,danielballan/scikit-xray,tacaswell/scikit-xray