change it so that a hole is described by a single class
fix "black holes"
fix thermal flux calculation
some plot improvements
add feature to get clean thermal and flux maps
add virtual timestep parameter
I use material and effective so that it is clear what the variable represents even though this might not correspond to the physical meaning of these words
I use material and effective so that it is clear what the variable represents even though this might not correspond to the physical meaning of these words