Department Rate feature

Includes only the files related to saving/editing a Department's default
billing rate. Includes an updated schema.php in /InstallBundle/Data
directory so that installing using this schema file should include the
Department "rate" column. Other "build" related configurations were not
updated so may indicate a file<->database version inconsistency. Saving
mostly just for documenting the database change. Don't know how to do
the Doctrine migrations from within DeskPRO context.
Agent Default Billing Department Feature

Files associated with allowing a Default Billing Department to be set
for an agent. Includes a new schema file in /InstallBundle/data/ that
reflects changes to the People Table (Person Entity) which has a Foreign
Key relationship to the Department Entity. No other "build" work was
done so may give an error about mismatch file<->database version.
Ticket Billing automatic calculation based on agent's department default rate