instead of accessing the 'environ' dict directly

  inside Five/browser/resource.py

- Moved exception MountedStorageError from ZODB.POSExceptions
  to Products.TemporaryFolder.mount (now its only client).

- LP #253362:  Moved Zope2-specific module, ZODB/Mount.py, to
  Products/TemporaryFolder/mount.py (its only client is
  Products/TemporaryFolder/TemporaryFolder.py).

- Removed spurious import-time dependencies from
  Products/ZODBMountPoint/MountedObject.py.

Updated to match all new versions from the yet-unreleased Zope 3.4.1 release (`http://svn.zope.org/zope.release/branches/3.4/releases/controlled-packages.cfg?rev=99659`).

        header if it is already present - this can make cache configuration
        difficult. (merged 99493)

        using CRLF as requested by RFC 2616. (merged 90980, 92625)

over indexes if the result set is already empty.

  the user-permission report

o Added '__setstate__' to cope with old pickles missing a '_micros'
  attribute;  Python's pickling support was creating a new instance,
  *with* a '_micros' attribute, but not clearing that attribute before
  updating the instance dict with the unpickled state.

  through exceptions