Changed naming (type) of material created for voltage source.

gprMax/sources.py

@@ -108,7 +108,7 @@ class VoltageSource(Source):
             newmaterial.ID = material.ID + '+VoltageSource_' + str(self.resistance)
             newmaterial.numID = len(G.materials)
             newmaterial.averagable = False
-            newmaterial.type = 'dielectric-smoothed, voltage source'
+            newmaterial.type += ', voltage-source'
 
             # Add conductivity of voltage source to underlying conductivity
             if self.polarisation == 'x':