sippi_plot_data: Plot data response
 
  Call:
     sippi_plot_data(d,data);
 
  sippi_plot_data provides a very simple way to plot data. 
  A more appropriate data plot can be implemented by implementing a new
  mfile called "sippi_plot_data" and add it the Matlab path before the 
  main SIPPI folders
 
  A maximum of options.plot.plot_data_max_data (def:=5) data is plotted.
  Change the value in sippi_plot_defaults.m
 
  A specific m-file for handling plotting for a specfic type of data can
  be implemented, and can be called instead of sippi_plot_data, if the name
  of the m-file is set in the options.sippi_plot_data_functions is set, as
  e.g:
     options.sippi_plot_data_function='sippi_plot_data_gpr';
  then 
     sippi_plot_data(d,data,[],options)
     sippi_plot_data(d,data,1:length(d),options); 
  will be equivalent to call
     sippi_plot_data_gpr(d,data); 
 
  
 
  
  See also sippi_plot_defaults, sippi_plot_data_gpr