Declaring (mostly singleton) classes as final to help the compiler.

Framework/API/inc/MantidAPI/AlgorithmFactory.h

Framework/API/inc/MantidAPI/AlgorithmHistory.h

Framework/API/inc/MantidAPI/AnalysisDataService.h

Framework/API/inc/MantidAPI/ConstraintFactory.h

Framework/API/inc/MantidAPI/FunctionFactory.h

Framework/API/inc/MantidAPI/ParameterTie.h

Framework/API/inc/MantidAPI/Progress.h

Framework/API/inc/MantidAPI/PropertyManagerDataService.h

Framework/DataObjects/src/EventWorkspace.cpp

Framework/Kernel/inc/MantidKernel/ConfigService.h

Framework/Kernel/inc/MantidKernel/Exception.h

Framework/Kernel/inc/MantidKernel/FunctionTask.h

Framework/Kernel/inc/MantidKernel/NullValidator.h

Framework/Kernel/inc/MantidKernel/ThreadPool.h

Framework/Kernel/inc/MantidKernel/UnitFactory.h