Things to check post-refactor

[hjabbot]

The following commits are changes that may be overwritten when the first stage of the RP refactor is merged into main. We should check that this functionality exists after merging those changes, and reimplement them if it doesn't.

• [x] Failing Dijkstra convergence crash

https://github.com/antarctica/PolarRoute/commit/45d992dfa4e1c1fbe62b62f4c80b00a69a66c13d

• [x] Multiple Source Waypoints crash

https://github.com/antarctica/PolarRoute/commit/3bcb8147d34900d91ed29b492b0701a9ccbbeda5

• [x] Flexible Waypoints

https://github.com/antarctica/PolarRoute/commit/b93eaff327977abdeeae5e51aa9dc29f91e8d3c6

Of these: Flexible waypoints will definitely be overwritten Multiple source waypoints will probably be overwritten, but might exist in new code? Failing Dijkstra convergence might exist in the new code?

[gecoombs]

• [x] Also need to check that any fix implemented for #252 is preserved post-refactor.

[gecoombs]

• [x] Replicate zero current approach introduced in #259

[hjabbot]

• [x] Replicate use of longitude_domain() as implemented in #267

[gecoombs]

• [x] Also need to include the waypoint splitting that was done for #276