Analysis/Ostap: some improvement
Analysis/Ostap
- improve prints for
PDF
s - add specialized prints for simple/trivial
PDF
s - eliminate
makeBkg
- improve doxygen and comments
- add new qmtest (thanks to @bursche )
This MR for run2-patches
. For master
and 2018-patches
please apply it only after !390 (merged) and !391 (merged)