switching mn to nm for compatibility

src/new/tutorials/example_cav.kat

@@ -26,10 +26,10 @@ m ETM 0.999 0.001 0 n3 n4
 map ETM CVI1-S1-BC_for_finesse.txt 
 
 # Name of file to save coupling coefficients
-kmn ETM ETM_map_coupling
+knm ETM ETM_map_coupling
 
 # Save binary file for coupling coefficients
-conf ETM save_kmn_binary 1
+conf ETM save_knm_binary 1
 
 # Set integration method (1 = Riemann method)
 conf ETM integration_method 1