DBBaseContext :: notifyDirty - Dirty notification handler

The dirty notification (SE_Dirty event) is sent from server in order to inform the client that the database is outdated and need to synchronized.

Typically, the event is handled by the system by sending a synchronize request to the server. The handler can, however, be overloaded in specialized object space context class implementations. When overloading the handler, the base class implementation need to be called in order to synchronize databases, except the handler manages database synchronization.