UP-4233 : Add in ability to generate update scripts

This adds the `ant` command:
 `db-gen-update-script`                   Generates the SQL files for a database upgrade.

It requires a parameter of what directory you want to dump the sql files.  3 files are generated, one for each database.  This utilizes the database connections setup in rdbm.properties.
:heart: the helpful message on forgotten `-DoutputDir`.