Plaq, Rectangle, Iwasaki, Symanzik and DBW2 workign and HMC regresses to http://arxiv.org/pdf/hep-lat/0610075.pdf

TODO

@@ -1,5 +1,27 @@
 TODO:
 ---------------
+
+* Forces; the UdSdU  term in gauge force term is half of what I think it should
+  be. This is a consequence of taking ONLY the first term in:
+
+  dSg/dt = dU/dt dSdU + dUdag/dt dSdUdag
+
+  in the fermion force.
+
+  Now, S_mom = - tr Pmu Pmu      ; Pmu anti-herm
+
+                                  .
+       d Smom/dt = - 2.0 tr Pmu Pmu   = - dSg/dt = - tr Pmu [Umu dSdUmu + UmuDag dSdUmuDag]
+
+           .
+       => Pmu =  Umu dSdUmu
+
+       Where the norm is half expected.
+
+  This means we must double the force in the Test_xxx_force routines, and is the origin of the factor of two.
+  This 2x is applied by hand in the fermion routines and in the Test_rect_force routine.
+
+
 Policies:
 
 * Link smearing/boundary conds; Policy class based implementation ; framework more in place