DOC: move trellis under visualization.rst
BUG: Bug in alignment with TimeOps and non-unique indexes (GH8363)
BUG: rolling_window() properly averages weights in mean=True mode; removed scikits-timeseries dependency for testing; added further tests for rolling_window()
BUG: OLS with clustering and nw_lags does not error (GH5884)

Added statement to raise ValueError when OLS is run with clustering and
Newey-West adjustments. Closes GH5884.
BUG: to_clipboard output formatting (GH8305)
BUG/COMPAT: set tz on DatetimeIndex on pickle reconstruction (GH8367)
TST: suppress gratuitous warnings
Added file path existence check for read_hdf