- Hide edit link on mobile, on flatpages
- Hide column headers on mobile, on basket page "Items to buy later"
  table
- Hide edit link on mobile, on category page
- Move dislay of various elements from "sm" to "md" grid tier
- Display error icon on navigation tab, on dashboard category-form page
- Increase "z-index" of dropdown menu on dashboard, so that it appears
  above all other elements
- Remove useless "top-spacer" class from dashboard review-list page
- Fix typo in use of template tag, on dashboard category-delete page
- Remove repeated display of non-field errors, and hidden fields, on
  dashboard category-form page

Where an initial value is required, this should be set on the form field
itself.

Fixes #3590.

Bumps [gulp-sourcemaps](https://github.com/gulp-sourcemaps/gulp-sourcemaps) from 2.6.5 to 3.0.0.
- [Release notes](https://github.com/gulp-sourcemaps/gulp-sourcemaps/releases)
- [Commits](https://github.com/gulp-sourcemaps/gulp-sourcemaps/compare/v2.6.5...v3.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [flake8-debugger](https://github.com/jbkahn/flake8-debugger) from 3.2.1 to 4.0.0.
- [Release notes](https://github.com/jbkahn/flake8-debugger/releases)
- [Commits](https://github.com/jbkahn/flake8-debugger/compare/3.2.1...4.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Updates the requirements on [django-extensions](https://github.com/django-extensions/django-extensions) to permit the latest version.
- [Release notes](https://github.com/django-extensions/django-extensions/releases)
- [Changelog](https://github.com/django-extensions/django-extensions/blob/master/CHANGELOG.md)
- [Commits](https://github.com/django-extensions/django-extensions/compare/2.2.0...3.1.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [requests](https://github.com/psf/requests) from 2.24.0 to 2.25.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/master/HISTORY.md)
- [Commits](https://github.com/psf/requests/compare/v2.24.0...v2.25.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [eslint](https://github.com/eslint/eslint) from 7.13.0 to 7.14.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v7.13.0...v7.14.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Improve `available` method of `LineOfferConsumer` class
* Add `quantity_available_for_offer` method to `AbstractLine` class
* Improve conditions: "Get num matches" methods updated to use `quantity_available_for_offer`
method of `Line` model.
* Improve conditions: `get_upsell_message` methods updated to show upsell message only in
the cases where `delta` > 0.
* Ensure basket upsell messages are not `None`

Also fix "is_anonymous" attribute value in WebTestCase subclass.

Updates the requirements on [ipython](https://github.com/ipython/ipython) to permit the latest version.
- [Release notes](https://github.com/ipython/ipython/releases)
- [Commits](https://github.com/ipython/ipython/compare/7.12.0...7.19.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [eslint](https://github.com/eslint/eslint) from 7.11.0 to 7.13.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v7.11.0...v7.13.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [ipdb](https://github.com/gotcha/ipdb) from 0.13.3 to 0.13.4.
- [Release notes](https://github.com/gotcha/ipdb/releases)
- [Changelog](https://github.com/gotcha/ipdb/blob/master/HISTORY.txt)
- [Commits](https://github.com/gotcha/ipdb/compare/0.13.3...0.13.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [pillow](https://github.com/python-pillow/Pillow) from 7.2.0 to 8.0.1.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst)
- [Commits](https://github.com/python-pillow/Pillow/compare/7.2.0...8.0.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [flake8](https://gitlab.com/pycqa/flake8) from 3.8.3 to 3.8.4.
- [Release notes](https://gitlab.com/pycqa/flake8/tags)
- [Commits](https://gitlab.com/pycqa/flake8/compare/3.8.3...3.8.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [isort](https://github.com/pycqa/isort) from 5.5.4 to 5.6.4.
- [Release notes](https://github.com/pycqa/isort/releases)
- [Changelog](https://github.com/PyCQA/isort/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/pycqa/isort/compare/5.5.4...5.6.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Use function as the return value of `get_url_decorator`. This change
needed because `get_url_decorator` method of `OscarConfigMixin` class
returns function or `None` and not string.

Fixes #3517.

It is done by default, from the "__init__" method of the parent class,
since commit 18eca6f76c.

Fix field lookups in ReportGenerator.filter_with_date_range

Fix checking field's "widget_type" value for CheckboxInput widget

It currently does not include 23:59:59, 00:00:00, and datetimes in the
one second between.

Regression introduced in commit 4bdf5df9b1.

- Remove unnecessary CSS in favour of Bootstrap defaults.
- Remove use of btn-lg whose presentation was being overridden in CSS.
- Fix a few classes on HTML elements.
- Fix required field styling, and remove duplicate non_field_errors on product edit page.

Replace Bootstrap 3 stateful button handling with custom JS for loading state.

Update django-debug-toolbar requirement from <2.3,>=2.2 to >=2.2,<3.2

Update several npm dependencies.

Updates the requirements on [django-debug-toolbar](https://github.com/jazzband/django-debug-toolbar) to permit the latest version.
- [Release notes](https://github.com/jazzband/django-debug-toolbar/releases)
- [Changelog](https://github.com/jazzband/django-debug-toolbar/blob/master/docs/changes.rst)
- [Commits](https://github.com/jazzband/django-debug-toolbar/compare/2.2...3.1.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Port all core templates and styles to Bootstrap 4.