Plone.app.querystring

-------------------

Fixes:

- Again upgrade collections with ``selection.is`` to
``selection.any``, because the standard events and news collections
may have been wrongly created in a new site.
Issue https://github.com/plone/Products.CMFPlone/issues/1040
[maurits]

- In tests, use ``selection.any`` in querystrings.
Issue https://github.com/plone/Products.CMFPlone/issues/1040
[maurits]

- Added upgrade step to replace ``selection.is`` with
``selection.any`` operations in querystrings also for objects using
the Collection behavior.
[thet]

-------------------

Fixes:

- Rerelease as something went wrong during upload of the package.
[maurits]

-------------------

Fixes:

- Added missing ',' for subject upgrade.
[ezvirtual]

------------------

Fixes:

- Fixed flake8 warnings.
[maurits]

- Updated compatibility information in README.
[maurits]

- Fixed resultview icons.
https://github.com/plone/Products.CMFPlone/issues/1151
[fgrcon]

- Added upgrade step to fix Subject index for existing collections.
[ezvirtual]

------------------

- Fixed problems introduced by merge.
[jensens]

- Add "before/after N days" functionality
[petschki]

- Fixed Sortable Indexes to not return ZCTextIndex type indexes.
[winstonf88]

------------------

- Fix vocabularies sorting
[ebrehault]