Wagtail

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* Fix: API listing views no longer fail when no site records are defined (Karl Hobley)
* Fix: Fixed crash in XML sitemap generator when all pages on the site are private (Stein Strindhaug)
* Fix: Fixed incorrect z-index on userbar causing it to appear behind page content (Stein Strindhaug)
* Fix: Fixed error in Postgres search backend when searching specific fields of a specific() Page queryset (Bertrand Bordage, Matt Westcott)
* Fix: Fixed error on Elasticsearch backend when passing a queryset as an `__in` filter (Karl Hobley, Matt Westcott)
* Fix: `__isnull` filters no longer fail on Elasticsearch 5 (Karl Hobley)
* Fix: Prevented intermittent failures on Postgres search backend when a field is defined as both a `SearchField` and a `FilterField` (Matt Westcott)

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* Front-end cache invalidator now supports purging URLs as a batch (Karl Hobley)
* Custom document model is now documented (Emily Horsman)
* Use minified versions of CSS in the admin by adding minification to the front-end tooling (Vincent Audebert, Thibaud Colas)
* Wagtailforms serve view now passes `request.FILES`, for use in custom form handlers (LB (Ben Johnston))
* Documents and images are now given new filenames on re-uploading, to avoid old versions being kept in cache (Bertrand Bordage)
* Added custom 404 page for admin interface (Jack Paine)
* Breadcrumb navigation now uses globe icon to indicate tree root, rather than home icon (Matt Westcott)
* Updated React to 15.6.2 due to relicensing (Janneke Janssen)
* User search in the Wagtail admin UI now works across multiple fields (Will Giddens)
* `Page.last_published_at` is now a filterable field for search (Mikalai Radchuk)
* Page search results and usage listings now include navigation links (Matt Westcott)
* Fix: "Open Link in New Tab" on a right arrow in page explorer should open page list (Emily Horsman)
* Fix: Using `order_by_relevance=False` when searching with PostgreSQL now works (Mitchel Cabuloy)
* Fix: Inline panel first and last sorting arrows correctly hidden in non-default tabs (Matt Westcott)
* Fix: `WAGTAILAPI_LIMIT_MAX` now accepts None to disable limiting (jcronyn)
* Fix: In PostgreSQL, new default ordering when ranking of objects is the same (Bertrand Bordage)
* Fix: Fixed overlapping header elements on form submissions view on mobile (Jack Paine)
* Fix: Fixed avatar position in footer on mobile (Jack Paine)
* Fix: Custom document models no longer require their own post-delete signal handler (Gordon Pendleton)
* Fix: Deletion of image / document files now only happens when database transaction has completed (Gordon Pendleton)
* Fix: Fixed Node build scripts to work on Windows (Mikalai Radchuk)
* Fix: Stop breadcrumb home icon from showing as ellipsis in Chrome 60 (Matt Westcott)
* Fix: Prevent `USE_THOUSAND_SEPARATOR = True` from breaking the image focal point chooser (Sævar Öfjörð Magnússon)
* Fix: Removed deprecated `SessionAuthenticationMiddleware` from project template (Samir Shah)
* Fix: Custom display page titles defined with `get_admin_display_title` are now shown in search results (Ben Sturmfels, Matt Westcott)
* Fix: Custom PageManagers now return the correct PageQuerySet subclass (Matt Westcott)
* Fix: API listing views no longer fail when no site records are defined (Karl Hobley)

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* Fix: Pin Beautiful Soup to 4.6.0 due to further regressions in formatting empty elements (Matt Westcott)

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* Fix: Pin django-taggit to <0.23 to restore Django 1.8 compatibility (Matt Westcott)
* Fix: Mark Beautiful Soup 4.6.1 as incompatible due to bug in formatting empty elements (Matt Westcott)

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* Fix: Fix support of `ATOMIC_REBUILD` for projects with Elasticsearch client >=1.7.0 (Mikalai Radchuk)
* Fix: Logging an indexing failure on an object with a non-ASCII representation no longer crashes on Python 2 (Aram Dulyan)
* Fix: Rich text image chooser no longer skips format selection after a validation error (Matt Westcott)
* Fix: Null characters in URLs no longer crash the redirect middleware on PostgreSQL (Matt Westcott)

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* Fix: API listing views no longer fail when no site records are defined (Karl Hobley)
* Fix: Pinned Django REST Framework to <3.7 to restore Django 1.8 compatibility (Matt Westcott)
* Fix: Fixed crash in XML sitemap generator when all pages on the site are private (Stein Strindhaug)
* Fix: Fixed error in Postgres search backend when searching specific fields of a specific() Page queryset (Bertrand Bordage, Matt Westcott)
* Fix: Fixed error on Elasticsearch backend when passing a queryset as an `__in` filter (Karl Hobley, Matt Westcott)
* Fix: `__isnull` filters no longer fail on Elasticsearch 5 (Karl Hobley)
* Fix: Prevented intermittent failures on Postgres search backend when a field is defined as both a `SearchField` and a `FilterField` (Matt Westcott)