Add swap_local_nodes mutator
#786
| Job | Run time |
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| 34s | |
| 28s | |
| 3m 12s | |
| 1m 19s | |
| 1m 20s | |
| 1m 19s | |
| 1m 10s | |
| 1m 21s | |
| 1m 36s | |
| 2m 21s | |
| 1m 40s | |
| 1m 18s | |
| 1m 27s | |
| 54s | |
| 1m 1s | |
| 1m 1s | |
| 1m 47s | |
| 2m 27s | |
| 2m 0s | |
| 2m 31s | |
| 2m 26s | |
| 2m 23s | |
| 3m 18s | |
| 4m 49s | |
| 31s | |
| 44m 13s |