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.

Using the previously described variant using the index led to a broken installation because `pip` installs `Products.ZCatalog` 4.x. It expects to find `products.zcatalog` in the index. (Even downgrading to pip 1.5 does not help.)

This closes #194.

Explicitly require Manager role for `AltDatabaseManager`.

'bin/buildout -n' did not help.