Merge pull request #2711 from boyanmeng/BHE_GWF

...LocalAssemblers/HeatTransportBHELocalAssemblerSoil-impl.h

...tBHE/LocalAssemblers/HeatTransportBHELocalAssemblerSoil.h

...atTransportBHE/LocalAssemblers/IntegrationPointDataSoil.h

ProcessLib/HeatTransportBHE/Tests.cmake

Tests/Data/Parabolic/T/3D_2U_BHE/3D_2U_BHE.prj

...Data/Parabolic/T/3D_BHE_GW_advection/BHE_GW_advection.prj

...Data/Parabolic/T/3D_BHE_GW_advection/BHE_GW_advection.vtu

...W_advection/BHE_GW_advection_pcs_0_ts_10_t_500.000000.vtu

Tests/Data/Parabolic/T/3D_BHE_GW_advection/back.vtu

Tests/Data/Parabolic/T/3D_BHE_GW_advection/front.vtu

Tests/Data/Parabolic/T/3D_BHE_GW_advection/left.vtu

Tests/Data/Parabolic/T/3D_BHE_GW_advection/right.vtu

Tests/Data/Parabolic/T/3D_Beier_sandbox/beier_sandbox.prj

...arabolic/T/3D_Beier_sandbox/fixed_power_constant_flow.prj

Tests/Data/Parabolic/T/3D_deep_BHE/3D_deep_BHE_CXA.prj

Tests/Data/Parabolic/T/3D_deep_BHE/3D_deep_BHE_CXC.prj

.../benchmarks/heat-transport-bhe/3D_BHE_GW_advection.pandoc

...s/heat-transport-bhe/3D_BHE_GW_advection_figures/mesh.PNG

...eat-transport-bhe/3D_BHE_GW_advection_figures/rel_err.PNG

...e/3D_BHE_GW_advection_figures/temperature_soil_2years.PNG