Static-frame

Added ``iloc_searchsorted()`` and ``loc_searchsorted()`` to ``Index``, ``IndexDatetime``, and ``IndexHierarchy``.

Added ``ddof`` parameter to all containers that expose ``std`` and ``var``.

Fixed issue with ``Frame.assign`` where there was a dependency on the order of column labels given in selection.

Improved handling for NumPy Boolean types stored in SQLite DBs via ``StoreSQLite`` interfaces.

Improved `loc_to_iloc()` methods to raise for missing keys in `Index` created where `loc_is_iloc`.

Added ``Series.iloc_searchsorted()`` and ``Series.loc_searchsorted()``.

Interfaces of ``Frame.to_delimited()``, ``Frame.to_csv()``, ``Frame.to_tsv()``, and ``Frame.to_clipboard()`` are extended with parameters for control of quoting and escaping delimiters and other characters. The standard library's ``csv`` module is now used for writing.

API change: ``Frame.from_element_loc_items()`` renamed ``Frame.from_element_items``; ``Frame.from_element_iloc_items`` is removed.

``Frame.assign`` now returns a ``FrameAssign`` instance with an ``apply`` method to permit using the assignment target, after function application, as the assignment value.

``Series.assign`` now returns a ``SeriesAssign`` instance with an ``apply`` method to permit using the assignment target, after function application, as the assignment value.

``IndexDatetime`` subclasses now properly assign ``name`` attrs from an `Index` given as an initializer.

``Series.items()`` now returns labels of ``IndexHierarchy`` as tuples instead of ``np.ndarray``.

Added ``Batch.apply_except`` and ``Batch.apply_items_except`` to permit ignore exceptions on function application to contained Frames.

Added ``Batch.unique()``.

``Batch`` now supports operations on ``Frame`` that return an ``np.ndarray``.

Added ``Quilt.from_items()`` and ``Quilt.from_frames()``.

``Bus.sort_index()`` and ``Bus.sort_values()`` now return a ``Bus`` instance.

Improvements to ``Bus.items()``, ``Bus.values`` for optimal ``Store`` reads when ``max_persist`` is None.

Implemented ``Bus.rename()`` to return a ``Bus`` instance.

Implemented ``Bus.drop[]`` to return a ``Bus`` instance.

Implemented ``Bus.reindex()``, ``Bus.relabel()``, ``Bus.relabel_flat()``, ``Bus.relabel_level_add()``, ``Bus.relabel_level_drop()``, ``Bus.rehierarch()``.

Implemented ``Bus.roll()``, ``Bus.shift()``.

API change: ``Frame.sort_values()`` now has a ``label`` positional argument that replaces the former ``key`` positional argument.

API change: ``Frame.sort_values()`` now requires multiple labels to be provided as a list to permit distinguishing selection of single tuple labels.

API change: ``iter_labels.apply()`` on ``Index`` and ``IndexHierarchy`` now returns an np.ndarray rather than a ``Series``.

API change: ``iter_tuple`` and ``iter_tuple_items`` interfaces now require ``axis`` to be kwarg-only.

API change: ``iter_tuple``, ``iter_tuple_items`` methods now require an explicit ``tuple`` as constructor if fields are invalid NamedTuple attrs.

API change: ``iter_array``, ``iter_array_items``, ``iter_series``, and ``iter_series_items`` now require ``axis`` to be kwarg-only.

Added ``key`` argument for sort pre-processing to ``Frame.sort_values()``.

Added ``key`` argument for sort pre-processing to ``Index.sort()``, ``IndexHierarchy.sort()``, ``Series.sort_index()``, ``Series.sort_values()``, ``Frame.sort_index()``, ``Frame.sort_columns``

Implemented support for multiprocessing Frame loading from ``StoreZip`` subclasses used by ``Bus``, ``Batch``, and ``Quilt``.

Added ``read_max_workers``, ``read_chunksize``, ``write_max_workers``, ``write_chunksize`` to ``StoreConfig``.

Added ``include_index_name``, ``include_columns_name`` parameters to ``Frame.to_arrow``

Added ``include_index_name``, ``include_columns_name`` parameters to ``Frame.to_parquet``

Added ``index_name_depth_level``, ``columns_name_depth_level`` parameters to ``Frame.from_arrow``

Added ``index_name_depth_level``, ``columns_name_depth_level`` parameters to ``Frame.from_parquet``

Fixed issue where non-optimal dtype would be used for new columns added in reindexing.

Added immutable, hashable containers ``SeriesHE`` and ``FrameHE``.

Implemented ``read_many`` for all ``Store`` subclasses; ``Bus`` now uses these interfaces for significantly faster reads of multi-``Frame`` selections.

Improved handling of connection object given to ``Frame.from_sql``.

Improved type-preservation and performance when assigning ``Frame`` into ``Frame``.