Features

  - The ``BFG_DEBUG_AUTHORIZATION`` envvar and the
    ``debug_authorization`` config file value now only imply debugging
    of view-invoked security checks.  Previously, information was
    printed for every call to ``has_permission`` as well, which made
    output confusing.  To debug ``has_permission`` checks and other
    manual permission checks, use the debugger and print statements in
    your own code.

  - Authorization debugging info is now only present in the HTTP
    response body oif ``debug_authorization`` is true.

  - The format of authorization debug messages was improved.

  - A new ``BFG_DEBUG_NOTFOUND`` envvar was added and a symmetric
    ``debug_notfound`` config file value was added.  When either is
    true, and a NotFound response is returned by the BFG router
    (because a view could not be found), debugging information is
    printed to stderr.  When this value is set true, the body of
    HTTPNotFound responses will also contain the same debugging
    information.

  - ``Allowed`` and ``Denied`` responses from the security machinery
    are now specialized into two types: ACL types, and non-ACL types.
    The ACL-related responses are instances of
    ``repoze.bfg.security.ACLAllowed`` and
    ``repoze.bfg.security.ACLDenied``.  The non-ACL-related responses
    are ``repoze.bfg.security.Allowed`` and
    ``repoze.bfg.security.Denied``.  The allowed-type responses
    continue to evaluate equal to things that themselves evaluate
    equal to the ``True`` boolean, while the denied-type responses
    continue to evaluate equal to things that themselves evaluate
    equal to the ``False`` boolean.  The only difference between the
    two types is the information attached to them for debugging
    purposes.

  - Added a new ``BFG_DEBUG_ALL`` envvar and a symmetric ``debug_all``
    config file value.  When either is true, all other debug-related
    flags are set true unconditionally (e.g. ``debug_notfound`` and
    ``debug_authorization``).

  Documentation

  - Added info about debug flag changes.

  - Added a section to the security chapter named "Debugging
    Imperative Authorization Failures" (for e.g. ``has_permssion``).

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