Re #5378. Added ParDomain class

Code/Mantid/Framework/API/inc/MantidAPI/CompositeFunction.h

Code/Mantid/Framework/API/inc/MantidAPI/IFunction.h

Code/Mantid/Framework/API/inc/MantidAPI/ParamFunction.h

Code/Mantid/Framework/API/src/CompositeFunction.cpp

Code/Mantid/Framework/API/src/IFunction.cpp

Code/Mantid/Framework/API/src/ParamFunction.cpp

Code/Mantid/Framework/CurveFitting/CMakeLists.txt

...ork/CurveFitting/inc/MantidCurveFitting/CostFuncFitting.h

...urveFitting/inc/MantidCurveFitting/CostFuncLeastSquares.h

...Framework/CurveFitting/inc/MantidCurveFitting/ParDomain.h

...Framework/CurveFitting/inc/MantidCurveFitting/SeqDomain.h

...antid/Framework/CurveFitting/src/CostFuncLeastSquares.cpp

Code/Mantid/Framework/CurveFitting/src/FitMD.cpp

Code/Mantid/Framework/CurveFitting/src/FitMW.cpp

Code/Mantid/Framework/CurveFitting/src/ParDomain.cpp

Code/Mantid/Framework/CurveFitting/src/SeqDomain.cpp

Code/Mantid/Framework/CurveFitting/src/UserFunctionMD.cpp