* Fix the approve contract and approve forms

* make sure we can share error messages with the user

* Add PaymentRequest list view

* add card component and styles for payment request detail page

* move edit submission link onto the same line as view submission

* line card up with sidebar when there is one

* add spacing around contract approval button

* add styles for simplified project page and tweak payment request detail as a result

* Add Project list page

* Set action URL for submissions table search and filtering

* Add search and filtering to Project summary table

* Make table search placeholder configurable

* Enable search filtering for Project list page

* Make the choose file link intelligent

* Update the document chooser to user the model form and update tests

* Update the messaging to be more in line with other messages

* Make sure we tick the documents when all uploaded

* Tidy up the visual components (contract/links) on the detail page

* Tidy up how forms are contributed to the parent class

* Improve the delegated form base behaviour

* Refactor to remove the payments mixin

* Give the detail and edit views of the payment request their own view

* Remove the download link and change to a view

* Refactor the views to be better sorted

* Improve the interaction experience for payment requests and add activity

* Improve look of payment table to be a bit more bulked out

* Allow passing a path to the slack notification system

User.get_absolute_url was pointing at the wagtail admin which would expose the
admin urls to users on the frontend. The admin view is not necessarily the
"canonical" view for the user so should not be relied upon in the long run.

By allowing passing of a url to the slack notifier we allow the emitter to point
to the destination regardless of the more front end focused model method.

* Add PAF model and link to funds and labs

* Integrate the extra fields for the PAF into the PAF form

* Update tests to work with the new PAF field

Fixes some larger issues around how data is serialized and deserialized from the
db by the submissions class.

* fixup! Update tests to work with the new PAF field

* Rename PaymentRequest.value -> requested_value

* Add PaymentRequest.paid_value

* Expose "actual" value of a PaymentRequest

"Actual" value is paid_value when it exists or requested_value
otherwise.  This adds a property so it can get used with an instance and
updates the payments block QuerySet to let the database pick the right
values.

* Fix displaying form errors in messages

This sends one message per error and no longer uses Django's error
markup since our styles rendered the messages poorly.

* Update comment when changing PaymentRequest status

* add tooltip logic for submit for approval button
* update error bar styling on project page
* add tooltips and add to disabled button

* add simplified partial for styles used on the simplified project and submission pages

* Add Compliance email setting to Wagtail Admin
* Email compliance when a Project is approved
Ref #1334

* Move supporting documents to sidebar when project is in progress
* Test contract templatetags to confirm they show at the correct time
* Hide the supporting docs block when a Project is in progress
Ref #1379 

Change is related to how Django handles the error of the namespacing of the
URLs, in Django 2.0 it failed silently, on 2.1 it fails loudly. Including the
URL conf fixes this.

There are some fixes to the existing tests which were noticed to be wrong when
debugging

Ref #1231 
Ref #1462

* Fix payment request status labels

* Add change PaymentRequest.status flow

* Add delete payment flow