Improve error message when we have a unique constraint violation, displays the offending key in the error message

Issue 474: H2 Mysql Compatibility code fails to ignore "COMMENT" in CREATE TABLE, patch from Aaron Azeckoski

Add "-list" command line option to Shell tool so that result-list-mode can be triggered when reading from a file

JaQu: The data type VARCHAR is now (again) used for Strings (no longer TEXT, except when explicitly set).

Issue 463: Driver name and version are now the same in OsgiDataSourceFactory and JdbcDatabaseMetaData.

Referential integrity: when adding a referential integrity constraint failed, and if creating the constraint automatically created an index, this index was not removed.

make filename a constant

Changing the file extension means that syntax highlighting make the contents prettier :-)