- Update to 1.5.2:
* add PyType_Ready usage, issue #66
* speedup search() for bitarrays with length 1 in sparse bitarrays,
see issue #67
* add tests
* support signed integers in `util.ba2int()` and `util.int2ba()`,
see issue #85
* deprecate `.length()` in favor of `len()`
* Use `Py_ssize_t` for bitarray index. This means that on 32bit
systems, the maximun number of elements in a bitarray is 2 GBits.
We used to have a special 64bit index type for all architectures, but
this prevented us from using Python's sequence, mapping and number
methods, and made those method lookups slow.
* speedup slice operations when step size = 1 (if alignment allows
copying whole bytes)
* Require equal endianness for operations: `&`, `|`, `^`, `&=`, `|=`, `^=`.
This should have always been the case but was overlooked in the past.
* raise TypeError when tring to create bitarray from boolean
* This will be last release to still support Python 2.6 (which was retired
in 2013). We do NOT plan to stop support for Python 2.7 anytime soon.