Replace int(value.address)+offset with value.cast(unsigned char*)+offset.

It seems like int(value.address) fails on old versions of GDB.

Start 3.6.0rc1. (Note, patch level was incorrectly set to 3.6.0b4+ following b3. It is now b4+ again.)

PyStructSequence_Field, PyStructSequence_Desc, and wrapperbase are now of
type "const char *" rather of "char *".

Issue #27100:  With statement reports missing __enter__ before __exit__.  (Contributed by Jonathan Ellington.)

Issue #26163:  Disable periodically failing test which was overly demanding of the frozenset hash function effectiveness

Issue 28587:  list.index documentation missing start and stop arguments. (Contributed by Mariatta Wijaya.)

Allow AF_UNIX in create_server & create_connection

Issue 28475:  Improve error message for random.sample() with k < 0. (Contributed by Francisco Couzo).