``names`` argument added to ``Frame.unset_index``.
Improved handling of ``ILoc`` usage within ``loc`` calls.
Improved input and output from/to XLSX.
0.5.6
Frame.from_concat``, ``Series.from_concat`` now accept empty iterables.
``Frame.iter_group.apply`` and related routines now handle producing a `Series` from a multi-column group selection.
0.5.5
Index`` objects based on ``np.datetime64`` now accept Python ``datetime.date`` objects in ``loc`` expressions.
Fixed index formation when using ``apply`` on ``Frame.iter_group`` and ``Frame.iter_group_items`` (and related interfaces) when the ``Frame`` has an ``IndexHierarchy``.
Fixed issue in a ``Frame.to_frame_go()`` not creating a fully decoupled ``Index`` for columns in the returned ``Frame``.
0.5.4
Index`` objects based on ``np.datetime64`` now return empty Series when a partial ``loc`` selection does not match any values found in the ``Index``.
0.5.3
Frame.set_index_hiearchy`` passes on ``name`` to returned ``Frame``.
``Index`` objects based on ``np.datetime64`` now accept Python ``datetime.datetime`` objects in ``loc`` expressions.
Exposed ``interface`` attribute on ``ContainerBase`` subclasses.
0.5.2
Refinements to ``Series.isin()``, ``Frame.isin()``, ``Index.isin()``, and ``IndexHierarchy.isin()`` to better identify cases of unique elements.