IN PROGRESS - issue BATCH-453: Killed batches cannot be restarted

http://jira.springframework.org/browse/BATCH-453

The JdbcStepExecutionDao now stores the lastUpdated property of StepExecution into the StepExecution table.

spring-batch-core/src/main/resources/schema-hsqldb.sql

@@ -59,7 +59,8 @@ CREATE TABLE BATCH_STEP_EXECUTION  (
 	ROLLBACK_COUNT BIGINT , 
 	CONTINUABLE CHAR(1) ,
 	EXIT_CODE VARCHAR(20) ,
-	EXIT_MESSAGE VARCHAR(2500) ,
+	EXIT_MESSAGE VARCHAR(2500) ,
+	LAST_UPDATED TIMESTAMP ,
 	constraint JOB_EXEC_STEP_FK foreign key (JOB_EXECUTION_ID)
 	references BATCH_JOB_EXECUTION(JOB_EXECUTION_ID)
 ) ;