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

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

JobExecution now stores last updated time as well.

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

@@ -27,7 +27,8 @@ CREATE TABLE BATCH_JOB_EXECUTION  (
 	STATUS VARCHAR(10) ,
 	CONTINUABLE CHAR(1) ,
 	EXIT_CODE VARCHAR(20) ,
-	EXIT_MESSAGE VARCHAR(2500) ,
+	EXIT_MESSAGE VARCHAR(2500) ,
+	LAST_UPDATED TIMESTAMP ,
 	constraint JOB_INST_EXEC_FK foreign key (JOB_INSTANCE_ID)
 	references BATCH_JOB_INSTANCE(JOB_INSTANCE_ID)
 ) ;