Setup should create the sequence "SCHEDULER_MON_CHECKS_ID_SEQ" only if it doesn't exist

Current Situation:

• During the installer a database sequence "SCHEDULER_MON_CHECKS_ID_SEQ" will be created if it doesn't exist.
• The check wether the sequence already exists or not doesn't work properly and you get the error:

  java.sql.SQLException: sos.connection.SOSConnectionFileProcessor.process(137): an error occurred processing file [C:\Program Files\sos-berlin.com\jobscheduler\scheduler.id\db\pgsql\scheduler_mon_checks.sql]: sos.connection.SOSConnection.executeStatements(3173) : org.postgresql.util.PSQLException: ERROR: relation "scheduler_mon_not_id_seq" already exists
  

Desired Situation

• The sequence "SCHEDULER_MON_CHECKS_ID_SEQ" should created only if it doesn't exist.