Properly initializing anomaly_score and friends

Properly initialized the following variables as 0
so that they do not end up as "-" when used in a
logfile:
   tx.anomaly_score
   tx.sql_injection_score
   tx.xss_score
   tx.inbound_anomaly_score
   tx.outbound_anomaly_score

Set these in rule 900002.  Moved initialization of
tx.inbound_anomaly_score_level to the rule 900003, to that
900002 would be freed.