Update synchronization requirements documentation
Fix synchronization of deleteOrphanObjects():
- This is a caller of computeAllScoresWithoutCommit(). Therefore it has to constrain to its synchronization requirements.
- The following commits will deal with its callers.
Fix synchronization of verifyAndCorrectStoredScores():
- This is a caller of computeAllScoresWithoutCommit(). Therefore it has to constrain to its synchronization requirements
- Notice that the removed JavaDoc was incorrect with regards to the IntroductionPuzzleStore: computeAllScoresWithoutCommit() does not use it.