Merge from vendor branch TNF:

Merge from vendor branch TNF:
Prelude is a hybrid IDS consisting of multiple
sensors, managers, and a display console. This
is Prelude DB Library. It allow the interface
allowing Prelude to use a DBMS for alert storage.
While libprelude support a choice of MySQL or
postgreSQL, this package uses MySQL because it
was nearly an order of magnitude faster during
test operation.

This is one of several new packages in the Prelude family.