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change license: copyright by contributors

jdumas/CppNumericalSolvers,Daiver/CppNumericalSolvers,spinicist/CppNumericalSolvers,jdumas/CppNumericalSolvers,jdumas/CppNumericalSolvers,Daiver/CppNumericalSolvers,jdumas/CppNumericalSolvers,blefaudeux/CppNumericalSolvers,blefaudeux/CppNumericalSolvers,Daiver/CppNumericalSolvers,PatWie/CppNumericalSolvers,Daiver/CppNumericalSolvers,spinicist/CppNumericalSolvers,blefaudeux/CppNumericalSolvers,spinicist/CppNumericalSolvers,spinicist/CppNumericalSolvers,blefaudeux/CppNumericalSolvers