Don't try to create the schema each start

[Zoriot]

[21:36:13 WARN]: [TeachingTutorials] Could not save TutorialsDDL.sql to plugins/TeachingTutorials/TutorialsDDL.sql because TutorialsDDL.sql already exists.
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[george112n]

To be honest, if you want to change the entire way the DB ddl is initialised and updated then go ahead.
Links to #192.