Stop GraphPath being backwards

[adnathanail]

Closes #70

[github-actions]

(execution 4159201122 / attempt 1)

Dijkstra/Random graph/3000 nodes

                        time:   [73.911 ms 73.980 ms 74.049 ms]
                        change: [+0.2627% +0.3914% +0.5240%] (p = 0.00 < 0.05)
                        Change within noise threshold.
Found 1 outliers among 100 measurements (1.00%)
  1 (1.00%) high mild
Dijkstra/DIMCAS d1291/1291 nodes

                        time:   [8.7358 ms 8.7513 ms 8.7675 ms]
                        change: [+8.7906% +9.1483% +9.4927%] (p = 0.00 < 0.05)
                        Performance has regressed.
Found 4 outliers among 100 measurements (4.00%)
  4 (4.00%) high mild
Number of nodes: 28092
Graph initialised
Nodes added
Edges added
Dijkstra/OSM Monaco/9936 nodes

                        time:   [966.75 µs 966.88 µs 967.03 µs]
                        change: [+0.2521% +0.3505% +0.4220%] (p = 0.00 < 0.05)
                        Change within noise threshold.
Found 2 outliers among 100 measurements (2.00%)
  1 (1.00%) high mild
  1 (1.00%) high severe

Travelling salesman/DIMCAS d1291/1291 nodes

                        time:   [33.374 ms 33.418 ms 33.462 ms]
                        change: [+7.7748% +7.9768% +8.1846%] (p = 0.00 < 0.05)
                        Performance has regressed.
Number of nodes: 28092
Graph initialised
Nodes added
Edges added
Travelling salesman/OSM Monaco - 5 random nodes/5 nodes

                        time:   [54.270 µs 54.281 µs 54.290 µs]
                        change: [-0.8946% -0.8743% -0.8545%] (p = 0.00 < 0.05)
                        Change within noise threshold.

Number of nodes: 28092
Graph initialised
Nodes added
Edges added
Connected components/OSM Monaco/28092 nodes

                        time:   [59.703 ms 59.878 ms 60.053 ms]
                        change: [+1.1943% +1.6319% +2.0413%] (p = 0.00 < 0.05)
                        Performance has regressed.
Found 1 outliers among 100 measurements (1.00%)
  1 (1.00%) high mild