Shekel 7: best known minimum -10.40294, 30 seeds, 25000 evaluations at most per run, 80 particles
runs ending in the well at  PSO, global  PSO, ring
a1 = (4, 4, 4, 4)                    21         30
a3 = (8, 8, 8, 8)                     4          0
a4 = (6, 6, 6, 6)                     4          0
a7 = (5, 5, 3, 3)                     1          0
error below 1e-6                     20         30
evaluations (median)               7120      11080
