Opal

Completes the refactor of front end data, no longer using the `/api/v0.1/options/` API internally.
This is slated for removal in 0.8.0.

Updates DRF APIs - we now expect either Token or DjangoSession auth.

Fixes several small bugs with scaffolded applications - the setting of `STATIC_ROOT` and
`SECRET_KEY`, generating forms for NullBooleanFields, requirements.txt.

Adds an `aligned_pair` templatetag to the `panels` library.

Updates the label for `Demographics.birth_place` to indicate that this should be a country.

Adds the `clipboard` directive to give the user one click copy to clipboard.

Adds a `tag-select` directive that renders a widget for editing the tags for an episode.

Adds metadata to the scope for patient detail views

Updates to the Dependency Graph

* Django Axes 1.4.0 -> 1.7.0

Episode Categories

Refactors EpisodeCategory to be a discoverable feature.

Renames `Episode.category` -> `Episode.category_name`.

Episode JSON API

The Restful Episode JSON API previously available at `/episode/:pk/` is now moved into
`/api/v0.1/episode/:pk/` for consistency with the rest of our JSON APIs.
The Opal Angular layer has been updated to reflect this, and
should handle the transition seamlessly, but code calling the API directly should update
to reflect the new URL.

Defaults for records on the client side

Establishes a new way to define defaults for records initialized in Javascript without
requiring that we hard-code API names to defaults in a global namespace.


Update to Javascript Signatures

`Flow.enter()` and `Flow.exit()` now no longer take `options` positional arguments - instead
the controllers they initialize have `Metadata` and `Referencedata` as optional resolves
arguments.

AddEpisodeCtrl now no longer requires options as a resolves() option, but requires Referencedata
instead.

MaxLength for form helpers

The `input` form helper will now infer the max length of char fields from the max length of the
database field, and render relevant Angular directives.

EpisodeDetail removed

The `EpisodeDetailCtrl` and `EpisodeDetailMixin` controller and service have been removed - these
were not used anywhere other than in the Wardround plugin, and redundant after enhancements to
Patient Detail and Custom DetailViews in 0.6.

Additional utilities

Adds a datetimepicker templatetag that will render widgets for a Datetime field including time.

Adds a `date_of_birth_field` templatetag that renders a date of birth field complete with inteligent
validation. (Note this change also includes removing the old _partial/ template)

Updates dependency graph:

* Django -> 1.8.13

**Detail views**

Moves from episode oriented detail to patient oriented detail.
(All episodes plus x-episode views are available from a patient detail screen)

**Tagging**

As a performance optimisation for the frequent access of historic tags, untagging
an episode simply renders the tag inactive rather than deleting it and relying on
Django-Reversion for access to historical data.

**Date Formatting**

We now expect 'd/m/y' date formatting by default.

**Patient lists**

Lists are now declarative, and separate from teams. They are implemented as
subclasses of opal.core.patient_lists.PatientList.

**Forms vs. Modals**

Introduces a distinction between a form and a modal.
By default, we now use forms for subrecords, only overriding the modal if there
is something we want to do differently specifically in the modal.

**Command line tools**

Adds $opal checkout for switching between applications or application versions.

Models ContextProcessor

The 'opal.context_processors.models' Context Processor will allow you to access your
subrecords from templates without having to explicitly load them in a view. In turn,
this allows patterns like:

{% include models.Demographics.get_detail_template %}


Upgrade instructions:

Full upgrade instructions to work through any backwards incompatible changes are
provided in the Opal docs.

Changes the way old tags are handled.

Tags are no longer deleted episodes, rather they're marked as archived.

* Include local storage

* Speed up loading of the lookup lists
* Fix pagination issues in search
* Speed up loading of many to many fields
* Increase test coverage
* Add some extra help fields to {% forms %} helpers
* Fixes bug with $rootScope.open_modal() where keystrokes were being intercepted