Bitsets

-------------

Coerce ``other`` argument of ``frozenset``-compatible methods to bitset.

-------------

Fixed empty bitset ``__contains__`` to raise ``KeyError`` with non-member.

Support constructor override by ``series.List`` subclass.

Package info and documentation refinements.

-------------

Constructor always returns a new subclass (obsoleted ``cached`` argument).

Bitset instances can no more get instance dicts (enforce empty ``__slots__``).

Full set of construction and conversion methods for bitset sequences.

Remove sanity assertions from set methods.

Improve documentation.

-------------

Fixed ``.from_members()`` with string arguments.

-----------

First public release.