Merge of opti Jo's branch

class_install.sh

gui/CLASSGui.cxx

gui/CLASSRead.cxx

gui/CLASSRead.hxx

gui/CLASSWin.cxx

gui/CLASSWin.hxx

source/Makefile

source/Model/Equivalence/EQM_FBR_MLP_Keff.cxx

source/Model/Equivalence/EQM_MLP_Kinf.cxx

source/Model/Equivalence/EQM_MLP_PWR_MOxEUS.cxx

source/Model/Equivalence/EQM_MLP_PWR_MOxEUS.hxx

source/Model/Equivalence/EQM_PWR_FixedContent.cxx

source/Model/Equivalence/EQM_PWR_FixedContent.hxx

source/Model/Equivalence/EQM_PWR_MLP_MOX.cxx

source/Model/Equivalence/EQM_PWR_MLP_MOX_Am.cxx

source/Model/Equivalence/EQM_PWR_MLP_MOX_Am.hxx

source/Model/Equivalence/EQM_PWR_POL_UO2.cxx

source/Model/Irradiation/IM_Matrix.cxx

source/Model/Irradiation/IM_RK4.cxx

source/Model/XS/XSM_CLOSEST.cxx