WIP: Add select action examples to tutorial

There's two issues. `hsimple.root/ntuple/!select/px>1/!draw/px` shows 4003 entries (correct).

1. `hsimple.root/ntuple/!select/px>1/!scan/*` shows 16 entries (too few, probably only considers first 100 entries)
2. `hsimple.root/ntuple/!select/px>1/!csv` (too many, doesn't apply selection at all)

@pwaller Do you know how to fix this quickly or can you give me a hint where to start?