BUG: fix reading multi-level index in python parser
Merge pull request #7029 from mcwitt/csv_mi_bug

BUG: fix reading multi-index data in python parser
DOC: fix formatting on plot formattting

DOC: add KDE to other plots

more bits of foramtting
Merge pull request #7062 from TomAugspurger/visualization-doc3

DOC: One more cleanup on visualization.rst