* rename table to account_tutorial, because it holds account specific data;
* rename column account to accountId;
* introduce prepared statements for table.
- Separate rewarded quests from active quests, and store them in a new table to reduce database size
- Drop the no longer needed `rewarded` column from character_queststatus for smaller table size
- Prevent filling the database with dropped quests
- Delete useless records
- Implement queststatus save "queues" instead of states
- Minor optimizations
WARNING: Backup your database!
--HG--
branch : trunk
Azazel