Improvements in reporting of errors relating to attempts to create a duplicate in the database.
The HSQLDB test for a duplicate now checks for code -104, instead of -9 which is no longer used in the current versions (e.g. 2.3.2) of HSQLDB.
A blank line is inserted between the report of the SQL Exception, and the more user-friendly clue "Is what you are attempting to create a duplicate?".