[Gas] Small change to DBManager.pm

[Bob Cook]

Added a small change to DBManager.pm.
two new options for the constructor that were previously hard-coded.

1. -auto_commit: sets the DBI AutoCommit option (sometimes you may not
want to use this. Default is 1.
2. -raise_error: sets the DBI RaiseError option (this can be greater
than one to get more error output, and sometimes one might want to
suppress error messages. Default is 1.

-Bob

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* Bob Cook              On The Job Consulting *
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