Use float3DTensorT in type st_velocity

build/Makefile

src/disc_fourier.cpp

src/exchange_buffer.cpp

src/exchange_buffer.hpp

src/exchange_v.cpp

src/fd.hpp

src/float3DTensorT.cpp

src/float3DTensorT.hpp

src/freemem.cpp

src/fsource.cpp

src/ifos3d.cpp

src/initmem.cpp

src/seismo_ssg.cpp

src/snap_ssg.cpp

src/stfi.cpp

src/surface_ssg.cpp

src/surface_ssg_elastic.cpp

src/timeloop.cpp

src/update_s_ssg_CPML_acoustic.cpp

src/update_s_ssg_CPML_elastic.cpp