[Trunk | Admin tools]:
1. NotificationsService.java: [NEW] service for notifications with updatePid and deleteByPid methods.
2. LayoutService.java & StatisticsService.java & SubscriberService.java: Logs added.
a. [Bug fix] On "updateCommunity()" (/update) method update pid for related notifications, layout, statistics and subscribers (old_pid had the value of new_pid, not the old one).
b. Add update pid for notifications when updating portal pid | Delete related notifications by pid when deleting a portal.