Collective-collectionfilter

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

- Fix is_available property
[agitator]
- Added css_modifier to extend css class of a filter item
[agitator]
- Fix check for boolean values.
[tmassman]
- fix translation of ``filter_value``
[petschki]

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

Bug fixes:

- fix bug introduced with pattern option ``ajaxLoad``
[petschki]

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

Features:

- Restore 5.0.x compatibility
[djay, quang]
- Make ajax loading of results and portlets a pattern option is themers can override it
[quang]
- change collection picker to show parent by default so you don't have to click backwards
[djay]

Bug fixes:

- Fix double display of portlets profile
[agitator]
- Fix bug where filter urls was getting utf encoded then made into unicode again
[djay]
- Fix 5.2 where operators should not be used on all index types
[djay]
- Fix unfiltered results appearing in next page of batch
[djay]
- Fix bug where portlets didn't work without GeoLocation dependencies
[djay]

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

New features:

- Geolocation filter.
[petschki, thet]


Bug fixes:

- Remove dependency on plone.app.upgrade
[agitator]

- Constrain ``target collection`` to a configurable registry value.
The default is ``['Collection', ]``.
[petschki]

- Fix non-interable catalog metadata values for Python 3.
[petschki]

- Use Map Layer translations from plone.formwidget.geolocation
[petschki]

- Fix ``None`` value in ``safe_interable``
[petschki]

- Fix for empty SearchableText field (see 56)
[petschki]

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

Breaking changes:

- Remove support for Plone < 5.1.
[petschki]

New features:

- Python 3 compatibility.
[petschki]

- Test setup
[petschki]

Bug fixes:

- fix bug in render-portlet for Python 3.
NOTE on Python 3: this required plone.app.portlets >= 4.4.2
[petschki]

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

New features:

- Python 3 compatibility.
[agitator]

Bug fixes:

- Do not render an empty ``filterClassName``.
[thet]

- patCollectionFilter is not in settings, it’s in view.
[agitator]

- Fix styles for long/multiline filter terms
[agitator]