Static-frame

Extended application of binary equality operators to permit comparison with arrays of single elements.

Refined application of binary equality operators to permit comparison with strings or elements that are not sequences.

API change: ``__bool__`` of all containers now raises a ValueError.

API change: ``IndexHierarchy.iter_label`` now iterates over realized labels.

API change: ``IndexBase.union``, ``IndexBase.intersection`` no longer automatically unpack ``values`` from ``ContainerOperand`` subclasses.

API change: Container operands used with binary equality operators will raise if sizes are not equivalent

API change: ``Frame.from_xlsx``, as well as ``StoreConfig`` now set ``trim_nadir`` to False by default.

API change: ``Series.relabel_add_level`` to ``Series.relabel_level_add``, ``Series.relabel_drop_level`` to ``Series.relabel_level_drop``, ``Frame.relabel_add_level`` to ``Frame.relabel_level_add``, ``Frame.relabel_drop_level`` to ``Frame.relabel_level_drop``, ``Index.add_level`` to ``Index.level_add``, ``IndexHierarchy.add_level`` to ``IndexHierarcchy.level_add``, ``IndexHierarchy.drop_level`` to ``IndexHierarchy.level_drop``.

Frame.dtype`` interface now takes ``DtypesSpecifier``, permitting setting ``dtype`` by mapping, iterable, or single value.

``dtypes`` can be given as a single ``DtypeSpecifier`` for specifying ``dtype`` of all columns.

``Series`` of ``Frame`` can now be created without specifying ``dtype`` arguments.

``Frame`` now supports usage as a ``weakref``.

``Frame.from_parquet`` now raises when ``columns_select`` names columns not found in the file.

Fixed issue in implementation of ``trim_nadir`` when reading XLSX files.

Fixed issue in ``Frame.from_pandas`` when the columns have mixed types including integers.

Improved ``dtype`` preservation in zero-sized ``Series`` extraction from ``Frame``.

Added ``trim_nadir`` parameter to ``StoreConfig`` and ``Frame.from_xlsx``: permits removing all-None trailing rows and columns resulting from XLSX styles being applied to empty cells.