Add file `edgelist_Isic_2.csv`

Same as `edgelist_Isic_1.csv` but with lines out of order.

Trajectories/edgelist_Isic_2.csv

+15 16
+12 16
+11 12
+10 11
+9 13
+13 14
+1 2
+2 3
+2 4
+3 4
+4 5
+4 9
+5 6
+6 7
+7 8
+9 10
+14 15
+16 26
+26 27
+27 17
+27 20
+17 18
+18 19
+20 21
+21 22
+23 24
+23 25
+25 3