Add methods to print information about the evaluations

[delaossa]

• print_best_evaluations shows a table with the top scoring evaluations in the given objective. example:

  diags.print_best_evaluations(top=5)

  Top 5 evaluations in metric f1 (minimize = False):  [168, 125, 74, 47, 84]
  
           f1          f2         x0         x1
  168  897.356441  432.315095 -41.014755  12.668375
  125  806.129161  709.940631 -46.410127  11.699764
  74   770.447289  616.824412 -47.631321  11.454126
  47   757.891119  726.930477 -49.191153  12.272802
  84   739.310092  378.713516 -35.158977  12.262404

• print_evaluation shows the relevant parameters of a given evaluation. example:

  diags.print_evaluation(168)

  Evaluation 168: 
            sim_id = 168
          dir_path = tests_output/test_exploration_diagnostics/evaluations/sim0168
  objective functions:
                f1 =  897.35644
                f2 =  432.31509
  varying parameters:
                x0 =  -41.01475
                x1 =   12.66837