Deletes and recreates ayai.h2.db each time the program is run. 

If you care enough about the bootup time for it to be worth the hassle of dealing with deleting that file manually and only when necessary see what changed in this commit. Basically that file only has to be deleted when the db structure is changed, which shouldn't be too often. However the front end people would probably not mind have a bit of extra load time on the backend if it means they'll never have the backend throw an exception. To ensure that works right this deletes the db file every time.