LDEV-4032 Non-leaders should be forced to wait for leaders to submit notebook and burning questions. Therefore they should not be allowed to press Finish button before these events.
LDEV-3971: Remove pointless synchronisation from Java methods. It would not work in multi-node environment anyway. Focus on DB transactions. General clean up and formatting.
LDEV-3742 Add Like feature for Scratchie * Implementation is a bit different for WF branch, as GET_BURNING_QUESTIONS_WITH_LIKES SQL query in ScratchieBurningQuestionDAOHibernate.java should be rewritten to comply with SQL92 standard introduced in MySQL 5.7.5