In main program unit `test_successive_overlap`, do not print eddies

for which `delta_out` == 1 and eddies for which `delta_in` == 1. This
is redundant with information in file `edgelist.csv`. I have checked
in test `Successive_overlap_global` that eddies for which `delta_out`
== 1 correspond to column i1 (sorted, unique) and eddies for which
`delta_in` == 1 correspond to column i2 (sorted, unique).