More tidying of code formatting

gprMax/input_cmds_singleuse.py

@@ -120,7 +120,7 @@ def process_singlecmds(singlecmds, multicmds, G):
     if G.messages:
         print('Model domain: {:.3f} x {:.3f} x {:.3f} m ({:d} x {:d} x {:d} = {:.1f} Mcells)'.format(tmp[0], tmp[1], tmp[2], G.nx, G.ny, G.nz, (G.nx * G.ny * G.nz)/1e6))
         mem = (((G.nx + 1) * (G.ny + 1) * (G.nz + 1) * 13 * np.dtype(floattype).itemsize + (G.nx + 1) * (G.ny + 1) * (G.nz + 1) * 18) * 1.1) + 30e6
-        print('Memory: ~{} required, {} available'.format(human_size(mem), human_size(virtual_memory().total)))
+        print('Memory (RAM) usage: ~{} required, {} available'.format(human_size(mem), human_size(virtual_memory().total)))
 
 
     # Time step CFL limit - use either 2D or 3D (default)