convertToBackup Command Extension (JAD-I-461)

Previously, the database convertToBackup function verified the integrity of the database and generated a restoreinfo file, creating the equivalent of a "restored backup".

The database convertToBackup function now creates a backupinfo file in addition to the restoreinfo file, creating the equivalent of a backup image that can be restored and recovered using standard database restore mechanisms. The result is both a backup and a "restored backup".