- don't check if result is None: it is e.g. 200 when request was
  handlded OK.
- don't patch sys.stdout at runtime - PStats ignore that - patch
  stats.stream

Zope 2.13: fixup! Add change log entry for #395

That changelog entry was referencing another PR

Enable history page for OFS.Image.File

add some assertions on the html returned by manage_historyCompare

Zope 2.13: SiteAccess: Make VirtualHostMonster support IPv6

from https://bugs.launchpad.net/zope2/+bug/699865 :

VirtualHostMonster does not work with IPv6 named hosts.

In case of such rewrite configuration:

RewriteRule (.*) http://10.0.243.129:9280/VirtualHostBase/https/[%{SERVER_ADDR}]:4080$1 [L,P]

When SERVER_ADDR is fd00::74ba VirtualHostMonster dies with:

Traceback (most recent call last):
  File "/eggs/Zope2-2.12.14-py2.6-linux-x86_64.egg/ZPublisher/BeforeTraverse.py", line 145, in __call__
    meth(*(container, request, None)[:args])
  File "/eggs/Zope2-2.12.14-py2.6-linux-x86_64.egg/Products/SiteAccess/VirtualHostMonster.py", line 154, in __call__
    host, port = host.split(':')
ValueError: too many values to unpack

This is because IPv6 addresses contain ":" in them.

--
This is backport of https://github.com/zopefoundation/Zope/pull/314 to
2.13 branch

This also include part of:
2e9d01ea - flake8 Products/Shared/ZTUtils.
removing test_suite function from the test

Use the standard history page, enabled using the same condition than the one
that enables the text area on edit (ie. the file must be text or javascript and
reasonably sized)

* Port the fix for #375 to Zope 2.13.
* Fix version ranges to be able to run buildout.

[skip ci]

(cherry picked from commit e1baf42f591101f04b5dfc2366d1c17d41dd2fe5)

* Add tests to check the DoS prevention code.

* Add `._pasteObjects()` to be able to paste objects without limits.

Fixes #217.

Test that `str.format` checks security for accessed keys and items.

The PR was merged, but we still need a checkout at this moment.

The real fix is in the AccessControl package, which we checkout on a specific branch here.
Part of PloneHotfix20171128.

Make Redirect unavailable as url [2.13]

Skip IPv6 tests on Travis, as it is not supported.