o.c.domain.desy.epics: add isAlarm method again for dal2 tests
o.c.cagateway: bugfix for error messages
Merge remote-tracking branch 'origin/rel15x' into rel15x

Conflicts:
	applications/plugins/org.csstudio.cagateway/src/org/csstudio/cagateway/DoocsFloatingPV.java
	applications/plugins/org.csstudio.domain.desy.epics/src/java/org/csstudio/domain/desy/epics/alarm/EpicsAlarmStatus.java