LMS-940 yeastx: send emails with error notifications, improve error messages

...stemsx/cisd/etlserver/PropertiesBasedETLServerPlugin.java

rtd_yeastx/.classpath

...java/ch/systemsx/cisd/yeastx/etl/BatchDataSetHandler.java

...h/systemsx/cisd/yeastx/etl/BatchDataSetInfoExtractor.java

...emsx/cisd/yeastx/etl/DataSetMappingInformationParser.java

...a/ch/systemsx/cisd/yeastx/etl/DatasetMappingResolver.java

.../java/ch/systemsx/cisd/yeastx/etl/DatasetMappingUtil.java

...stx/source/java/ch/systemsx/cisd/yeastx/etl/LogUtils.java

...ystemsx/cisd/yeastx/etl/DataSetInformationParserTest.java