Wazimap

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* Replace calls to .itervalues with calls to .values()

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* Upgrade to python 3
* Upgrade to django 2
* Return fieldtable id from as_dict
* better object representation of fieldtable object.

This release of Wazimap introduces some backwards incompatible changes. You WILL need to follow the upgrade steps.
Be sure to upgrade to 1.x before upgrading to 2.x.

* Wazimap now supports multiple releases of a dataset. This means that you can, for example, have two releases of a national census in Wazimap at the same time. You will need to make some changes to how you build profile pages.
* BREAKING: SimpleTable and FieldTable are now Django models.
* BREAKING: Table management is now done through the Django admin interface. You must upgrade your existing tables.
* BREAKING: ``get_objects_by_geo`` has been replaced by ``FieldTable.get_rows_for_geo``.

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* FIX another bug for versioned geos for static maps

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* FIX support for versioned geos for static maps

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This release of Wazimap introduces some backwards incompatible changes.

* Support versioned geographies.
* BREAKING: The Geography model has changed. You must run ``python manage.py migrate`` when updating.
* BREAKING: The method signature of the ``profile_builder`` function has changed. It is now called as ``get_profile(geo, profile_name, request)``. You will need to update your profile methods to work with a ``geo`` object rather than a ``level`` and a ``code``. Use ``geo.geo_level`` and ``geo.geo_code`` instead.
* BREAKING: Some methods on the ``GeoData`` object now take a ``Geography`` object rather than a ``geo_level`` and a ``geo_code``.
* BREAKING: The ``geometry_data`` setting must include a geography version at the top of the dict. Use ``''`` by default. eg: ``{'': {'country': 'geo/country.geojson'}}``
* Some methods on the ``GeoData`` object now take an optional ``version`` parameter.
* A new method ``GeoData.get_comparative_geos`` makes it easier to build the profile page for comparative geographies.
* FIX: load streetmap tiles over https if necessary
* FEATURE: site menu
* FEATURE: use SCSS stylesheets, support customising using SCSS variables.
* Attribution updates to reflect OpenUp, the new name for Code for South Africa.