Improvements to jobmanager logging

castor/db/oracleCommon.schema.sql

castor/db/oracleJob.sql

castor/db/oracleStager.sql

castor/db/stager_oracle_create.sql

castor/jobmanager/IJobManagerSvc.hpp

castor/jobmanager/JobManagerDaemon.cpp

castor/jobmanager/ManagementThread.cpp

castor/jobmanager/SubmissionProcess.cpp

castor/jobmanager/ora/OraJobManagerSvc.cpp

castor/jobmanager/ora/OraJobManagerSvc.hpp

upgrades/stager_2.1.9-3_to_2.1.9-4.sql