Explain where to put trainee answer
Update tests to work via roundtrip, and add scaffold
Remove out fixtures
Merge branch 'master' into author_answers

Conflicts:
	data/fileformats/reactions/formats/format_csv.py
	data/fileformats/reactions/test/fixtures/system1out.csv
Fix CSV reader solution for roundtrip tests
Implement RDF writer, fix reader for roundtrip