Static-frame

Bus`` indices are no longer required to be string typed.

``StoreConfig`` adds ``label_encoder``, ``label_decoder`` parameters for translating hashables to strings and strings to hashables when writing to / from ``Store`` formats.

``Frame.from_sql`` now supports a ``columns_select`` parameter.

``StoreConfig`` now supports a ``columns_select`` parameter; ``columns_select`` parameters from ``StoreConfig`` are now used in ``StoreZipParquet``, ``StoreSQLite``.

Extended ``via_str.startswith()`` and ``via_str.endswith()`` functions to support passing an iterable of strings to match.

Improved ``IndexHierarchy.loc_to_iloc`` to support Boolean array selections.

Improvements to ``Quilt`` extraction routines.

Improved handling of invalid file paths given to constructors.

Improved implementations of ``Bus.items()``, ``Bus.values``, and ``Bus.equals()`` that deliver proper results when `max_persist` is active.

Implementation of ``Quilt``, a container that presents the contents of a ``Bus`` as either vertically or horizontally stacked ``Frame``.

Implemented ``__deepcopy__()`` on all containers.

Frame.iter_tuple_items()`` now exposes a ``constructor`` argument to control creation of axis containers.

Added ``Batch.apply_items``.

Added ``Frame.count``, ``Series.count``, ``Batch.count``.

Added ``Frame.sample``, ``Series.sample``, ``Index.sample``, ``IndexHierarchy.sample``, ``Batch.sample``.

Added ``Frame.via_T`` and ``IndexHierarchy.via_T`` accessors for opposite axis binary operator application of 1D operands.

IndexHierarchy.iter_label`` now defaults to iterating full depth labels.

``Batch.__repr__()`` is no longer a display that exhausts the stored generator.

``Frame.iter_tuple()`` now exposes a ``constructor`` argument to control creation of axis containers.

Fixed issue in using ``Frame.extend`` with zero-length ``Frame``.