improve error handling of loader so it is easy to tell which job has the problem

2010-06-16 08:30:44,752: [DefaultQuartzScheduler_Worker-8] ERROR GrouperLoaderResultset$Row.getSubject(299) - Problem with subjectId: 00179295, subjectSourceId: pennperson
edu.internet2.middleware.subject.SubjectNotFoundException: Subject not found: select penn_id,name,description,description_lower,pennname,email from person_source_v where penn_id = ?, 00179295
at edu.internet2.middleware.subject.provider.JDBCSourceAdapter2.search(JDBCSourceAdapter2.java:617)
at edu.internet2.middleware.subject.provider.JDBCSourceAdapter2.getSubject(JDBCSourceAdapter2.java:451)
at edu.internet2.middleware.grouper.app.loader.db.GrouperLoaderResultset$Row.getSubject(GrouperLoaderResultset.java:286)
at edu.internet2.middleware.grouper.app.loader.GrouperLoaderType.syncOneGroupMembership(GrouperLoaderType.java:1529)
at edu.internet2.middleware.grouper.app.loader.GrouperLoaderType$1.runJob(GrouperLoaderType.java:131)
at edu.internet2.middleware.grouper.app.loader.GrouperLoaderJob.runJob(GrouperLoaderJob.java:344)
at edu.internet2.middleware.grouper.app.loader.GrouperLoaderJob.execute(GrouperLoaderJob.java:247)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:529)