[Checkins] [zopefoundation/AccessControl] 750c16: Add deprecation warnings for BBB imports.

[Steffen Allner]

  Branch: refs/heads/add-deprecations
  Home:   https://github.com/zopefoundation/AccessControl
  Commit: 750c16736d4f535c0a216a0071b4d73388fd6ece
      https://github.com/zopefoundation/AccessControl/commit/750c16736d4f535c0a216a0071b4d73388fd6ece
  Author: Steffen Allner <sa at gocept.com>
  Date:   2020-09-28 (Mon, 28 Sep 2020)

  Changed paths:
    M CHANGES.rst
    M src/AccessControl/AuthEncoding.py
    M src/AccessControl/Owned.py
    M src/AccessControl/Role.py
    M src/AccessControl/User.py

  Log Message:
  -----------
  Add deprecation warnings for BBB imports.