thermal → iwg Relation

File in src/fem/thermal	Includes file in src/fem/iwg
cl_IWG_MaxwellThermal.hpp	cl_IWG_TransientHeatConduction.hpp
matrices / mt_thermal_h.cpp	cl_IWG_Timestep.hpp
matrices / mt_thermal_h.hpp	cl_TimestepMatrices.hpp
matrices / mt_thermal_phi.hpp	cl_TimestepMatrices.hpp