This class presents a pure-Python memory efficient packed representation for
bit arrays.
Fixed a potentially misleading documentation issue for the Windows users
of the BitVector class. If you are writing an internally generated
BitVector to a disk file, you must open the file in the binary mode. If
you don't, the bit patterns that correspond to line breaks will be
misinterpreted. On a Windows machine in the text mode, the bit pattern
000001010 ('\\n') will be written out to the disk as 0000110100001010
('\\r\\n').
Change introduced in version 1.3.1: Removed the inconsistency in the
internal representation ...