updating argotk for AMG and <8 processors

src/argotk.hs

@@ -240,8 +240,8 @@ configureTest RunAMG = mkRun updater "run AMG in the Argo stack."
                    , "3"
                    , "3"
                    , "-P"
-                   , "8"
-                   , repr $ quot tc 8
+                   , "2"
+                   , repr $ quot tc 2
                    , "1"
                    ]
     }