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* upstream/r/8.x:
  Configure POST api/groups access correctly (#2253)

* upstream/r/8.x:
  Fix typo in branding properties
  Validate Ingested DublinCore Catalogs
  Mark Outdated Development Documentation
  Correct spelling in recent 7.x Changelog

This patch makes the ingest service validate DublinCore catalogs when
they are being ingested and returning a 400 Bad Request instead of
accespting the request and failing afterwards with a broken workflow and
a broken entry in the admin interface.

To test this, just submit a broken DublinCore catalog like this:

```xml
 <dublincore xmlns="http://www.opencastproject.org/xsd/1.0/dublincore/"
     xmlns:dcterms="http://purl.org/dc/terms/"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
        <brokenxml
   <dcterms:creator>demo</dcterms:creator>
   <dcterms:contributor>demo</dcterms:contributor>
```

This fixes #2127

Pull request #2233
  Mark Outdated Development Documentation

This patch adds a hint to the development documentation of older
branches marking them as outdated and linking the documentation of the
branch `develop`.

triggered by the securoty typo

* upstream/r/8.x:
  Fix graphviz in Documentation
  Fix graphviz in Documentation
  Fix graphviz in Documentation
  Fix graphviz in Documentation

This patch fixes the graphviz based graphs in Opencast's documentation
deployments.

This patch fixes the graphviz based graphs in Opencast's documentation
deployments.

This patch fixes the graphviz based graphs in Opencast's documentation
deployments.

This patch fixes the graphviz based graphs in Opencast's documentation
deployments.

* upstream/r/8.x:
  Automatic Documentation Deployment
  Updated Release Notes
  Fix Sorting Series by Creators
  Fix Graphviz Graphs
  Fix documentation build requirement docs
  Fix Ingest by Non-privileged User

This patch automatically deploys Opencast's documentation every time code
is pushed to `develop` or one of the release branches.

On `develop`, the landing and error pages for docs.opencast.org are
generated as well

Backport of:
- c17250d1fd97f305ef5afcd288e3c374ec052898
- 6f904050ae4fbb56375254ed7a535400c9d46b80

Pull request #2177
  Fix Sorting Series by Creators

This patch fixes the sorting of series by its creators in the admin
interface which was broken due to an incorrect sort term being used.

The syntax for including Graphviz graphs seems to have changed slightly.

Pull request #2160
  Fix Ingest by Non-privileged User

This patch fixes non-scheduled ingests by non-privileged users which can
currently run into the problem that they don't get the necessary access
rights.

* upstream/r/8.x: (129 commits)
  Document Security Fix
  Updated Release Notes
  Updated Release Notes and Changelog
  Re-Enable Hostname Verification
  Endtime of segments fixed in the editor
  Support faster playback rates in paella video player
  Build Badge
  Disable Travis CI
  Automatically Update Translations
  Automatically Update Crowdin Keys
  Opencast CI Tests
  Automatically update translation keys (r/7.x)
  Removing duplicate JDK version support bits from the source install docs.  Adding a hard exit on startup if an incorrect JDK is in use.
  JDK Support proposal (2020-11-11) documentation for 8.x
  Removed trailing whitespace from releasenotes
  Updated Release Notes
  Reduce IO Load When Starting a Workflow
  Solves #2034
  Fix unit test for filter date picker time range
  #1987 Admin UI event start filter datepicker timezone patch
  ...

Pull request #2049
  Endtime of segments fixed in the editor

This patch is a minimal change to re-enable HTTPS hostname verification
of Opencast's HTTP client used for a large portion its HTTP requests.

Hostname verification is an important part when using HTTPS to ensure
that the presented certificate is valid for the host. Disabling it can
allow for man-in-the-middle attacks.