DOC: Inject small measure of sanity to line width on wide screen
BUG: GH3468 Fix assigning a new index to a duplicate index in a DataFrame would fail
ENH: support for having duplicative indices across blocks (dtypes)
BUG: fix construction of a DataFrame with duplicative indices
BUG: enabled applymap to work (and updated internals/convert to use iget) when

     using a non-unique index (GH2786 for the warning and GH3230 for applymap)

TST: test for GH2194 (which is fixed)