[hibernate-dev] Refactor MySQL Dialects

Hi, While working on MariaDB Dialects, I realize that we should also refactor the MySQL ones. The problem is that we introduced the InnoDB hierarchy. Since the only difference between those two is related to 3 methods, I think we should hide them behind a MySQLStorageEngine hierarchy with InnoDB being the default one. This way, we'll have a single MySQL Dialect hierarchy, and users can switch to MyISAM via a configuration property which define what MySQLStorageEngine implementation we are using. Let me know what you think. Vlad