sippi_plot_movie plot movie of prior and posterior realizations
 
  Call :
    sippi_plot_movie(fname);
    sippi_plot_movie(fname,im_array,n_frames,skip_burnin,i_chain);
       fname : name of folder with results (e.g. options.txt)
       im_array : array of indexes of model parameters to make into movies
       n_frames [200] : number of frames in movie
       skip_burnin [200] : start movie after burn_in;
       i_chain[1]: make movie of chain number 'i_chain' (new 22/05/2014)
 
  Ex:
  sippi_plot_movie('20130812_Metropolis');
  sippi_plot_movie(options.txt);
 
  %% 1000 realization including burn-in, for prior number 1
  sippi_plot_movie('20130812_Metropolis',1,1000,0);
 
  Using options.plot.skip_seq_gibbs=1, (set in sippi_plot_defaults)
  removes realizations obtained using sequential Gibbs sampling 
  (equivalent to setting skip_burnin=1)
 
  See also: sippi_plot_defaults