Plotting options

[samuel-rosa]

Several plotting options can be included:

1. Chose which plot is shown:
   a) the evolution of the energy state and acceptance probabilities;
   b) the sample configuration;
   c) both;
2. Set the plotting interval (number of iterations between each plot update);
3. Choose between showing the point that is being jittered and the new point;
4. Choose to plot the evolution of optimization after a given number of iterations. This is useful to speed up the computations in the beginning of the optimization and follow its evolution only in the last iterations.