Revert "TST: Log scale on bar chart hides bars GH3247" mpl 1.2.1 regression

This reverts commit 682b39ed851c272aef4872dc59571c4266cd2ff4.
BUG: pprint_thing should pprint and limit nested sequences when formatting dicts GH3251
BUG: honor repr() of proper subclasses of dict/ODict in pprint_thing GH3251
CLN: whitespace cleanups