Plone.formwidget.geolocation

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

- Make geolocation formwidget work with ``pat-leaflet``.
[thet]

- Support for Plone 5 only, using plone.patternslib and providing an own bundle.
[thet]

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

- Leaflet: After searching, bind new marker to update lat/lng input field and
remove MarkerClusterGroup. Fix annoying 'Uncaught Error: Couldn't autodetect
L.Icon.Default.imagePath, set it manually.'
[thet]

- Update Leaflet dependencies.
[thet]

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

- Add Leaflet as mapping widget. Use bower/grunt managed resources.
[thet]

- Remove the ``div.geolocation`` elements. Instead, render the list of
geolocation points as JSON value on a ``data-geopoints`` attribute on the map
element.
[thet]

- Reintroduce package level imports and avoid circular import by moving out the
message factory.
[thet]

- Remove the ``map`` id attribute on the map element and use instead a ``map``
css class.
[thet]

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

- Avoid circular imports by removing the package level imports.
[thet]

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

- PEP8.
[thet]

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

- Simplify templates and cleanup Google Map leftovers.
[thet]

- Convert default locations strings from Products.Maps to tuples with floats.
[thet]

- Improve handling of non-required geolocation fields
with missing values.
[davisagli]

- Fix display template markup to be compatible with recent versions
of Products.Maps.
[davisagli]

- Add supermodel import/export handler.
[davisagli]

- Fix declaration of exported names.
[davisagli]

- Remove dependency on Products.Maps. Don't fail, if default_location is not
set or maps_configuration adapter not found.
[thet]