update the tool XSD file

Update Training for new requirement definition

If there's no message to be sent there's no activity,
so I don't think this was needed.
If there's a message it should be pretty lightweight too,
I can run 32 processes with a sqlite database and not run into locking
issues when sending messages.

Drop amqp workaround

Fix warnings like:

```
planemo/shed/__init__.py:436: YAMLLoadWarning: calling yaml.load() without Loader=... is deprecated, as the default Loader is unsafe. Please read https://msg.pyyaml.org/load for full details.
  config = yaml.load(f)
```

Use ``yaml.safe_load()`` instead of ``load()``

Allow converting tool_test_report.json to xunit

See https://docs.python.org/2/library/xml.etree.elementtree.html#xml.etree.ElementTree.Element.getchildren

Fix error if testcase.data.job does not exist

Fix deprecated ``getchildren()``

Test reports xunit

Co-Authored-By: bernt-matthias <m.bernt@ufz.de>

Co-Authored-By: bernt-matthias <m.bernt@ufz.de>

Co-Authored-By: bernt-matthias <m.bernt@ufz.de>

before bioconda.

Tutorial fixes

Training: Support new class definition for input in workflow step

Training: add bibliography to tutorial template

Training: Fix empty repeat + some formatting

Fix traceback reported in
#939 (comment)

`static/scripts/libs/require.js` does not exists any more in Galaxy 19.05 .

Use ``unicodify()`` on exceptions and subprocess outputs

Partial solution to #946 (first attempt)

Do not override None with empty string