Added #transmission_line command for initial testing.

gprMax/input_cmds_file.py

@@ -130,7 +130,7 @@ def check_cmd_names(processedlines):
     singlecmds = dict.fromkeys(['#domain', '#dx_dy_dz', '#time_window', '#title', '#messages', '#num_threads', '#time_step_stability_factor', '#time_step_limit_type', '#pml_cells', '#excitation_file', '#src_steps', '#rx_steps'], 'None')
 
     # Commands that there can be multiple instances of in a model - these will be lists within the dictionary
-    multiplecmds = {key: [] for key in ['#geometry_view', '#material', '#soil_peplinski', '#add_dispersion_debye', '#add_dispersion_lorentz', '#add_dispersion_drude', '#waveform', '#voltage_source', '#hertzian_dipole', '#magnetic_dipole', '#rx', '#rx_box', '#snapshot', '#pml_cfs']}
+    multiplecmds = {key: [] for key in ['#geometry_view', '#material', '#soil_peplinski', '#add_dispersion_debye', '#add_dispersion_lorentz', '#add_dispersion_drude', '#waveform', '#voltage_source', '#hertzian_dipole', '#magnetic_dipole', '#transmission_line', '#rx', '#rx_box', '#snapshot', '#pml_cfs']}
     
     # Geometry object building commands that there can be multiple instances of in a model - these will be lists within the dictionary
     geometrycmds = ['#edge', '#plate', '#triangle', '#box', '#sphere', '#cylinder', '#cylindrical_sector', '#fractal_box', '#add_surface_roughness', '#add_surface_water', '#add_grass']