Guido broke the charge conjugate plaquette action with premature optimisation.

This sector of the code does not matter for anything other than Guido's quenched HMC
studies, and any plaq specific optimisations should be retained in a private branch
instead of destroying the code simplicity.

tests/forces/Test_gp_rect_force.cc

@@ -59,8 +59,8 @@ int main (int argc, char ** argv)
   double beta = 1.0;
   double c1   = 0.331;
 
-  //GparityPlaqPlusRectangleActionR Action(beta,c1);
-  ConjugateWilsonGaugeActionR Action(beta);
+  ConjugatePlaqPlusRectangleActionR Action(beta,c1);
+  //  ConjugateWilsonGaugeActionR Action(beta);
   //WilsonGaugeActionR Action(beta);
 
   ComplexD S    = Action.S(U);