fixing bug #4493
adding new method in PdcClassificationService.java which allows to define explicitly if subscribers must be notified or not when new contribution is classified.
The transaction is no more managed explicitly in the PdcClassifyBm implementation; it is either managed by a JTA/JPA transaction manager or automatically (autocommit). Replace the explicit JNDI name of the PdcSubscriptionBm EJB by the one defined with the corresponding field in the JNDINames class