Improve CommonMessaging

Implementation of GAUDI-1146: Improve CommonMessaging and use it in more
places.

See merge request !76

Conflicts:
	GaudiExamples/tests/qmtest/refs/AlgTools2.ref
	GaudiExamples/tests/qmtest/refs/MultiInput/Read.ref
	GaudiExamples/tests/qmtest/refs/conditional_output/write.ref
	GaudiKernel/GaudiKernel/AlgTool.h
	GaudiKernel/GaudiKernel/Algorithm.h
	GaudiKernel/GaudiKernel/Service.h
	GaudiKernel/src/Lib/AlgTool.cpp
	GaudiKernel/src/Lib/Algorithm.cpp