Add NO_MATIO CMake option to make MAT-IO library optional.

CMakeLists.txt

src/faust_linear_operator/CPU/faust_MatBSR.h

src/faust_linear_operator/CPU/faust_MatBSR.hpp

src/faust_linear_operator/CPU/faust_MatButterfly.h

src/faust_linear_operator/CPU/faust_MatDense.h

src/faust_linear_operator/CPU/faust_MatDense.hpp

src/faust_linear_operator/CPU/faust_MatDiag.h

src/faust_linear_operator/CPU/faust_MatDiag.hpp

src/faust_linear_operator/CPU/faust_MatSparse.h

src/faust_linear_operator/CPU/faust_MatSparse.hpp

src/faust_linear_operator/CPU/faust_Transform.hpp

src/faust_linear_operator/faust_MatGeneric.h

wrapper/python/CMakeLists.txt

wrapper/python/src/FaustCoreCpp.hpp

wrapper/python/src/FaustCoreCppCPU.cpp.in