In table.sql, changed isbn type to char(9) and sinOrStNo type to
varchar(10).  Isbn is always 9 digits, sin is 9 digits but student
numbers can have different lengths.  Changed java types in transactions
to reflect this.  Please pay attention to the types used in table.sql
when coding!

In process of debugging searchBook() in BorrowerUser.  Sql queries for
searchBySubject() and searchByAuthor() are buggy.