Control effective acceptance for when Propose_S0=.true.
When Propose_S0=.true., that means when the Ising moves get proposed according to the bare Ising action, the Acceptance printed in the info file shows the acceptance for flipping if a flip is proposed. But often no flip is proposed which is not factored into the Acceptance. Therefore one should define another Acceptance, called for example Effective Acceptance that counts a not proposed flip as rejection.