No linear postsmoothing

src/one-body-sample.parset

@@ -28,7 +28,7 @@ tolerance = 1e-12
 [solver.tnnmg.linear]
 nu1 = 1
 mu = 1
-nu2 = 1
+nu2 = 0 # FIXME: using linear postsmoothing appears to be a really bad idea
 
 [solver.tnnmg.main]
 # The canonical choice is 3-1-3. Since the nonlinear step is by far