Systems with multiple Null orbit points not rendered as intended

[iaincollins]

An example of a system not rendered as intended is the Farwell system, near Colonia.

It has Null orbit points between stars at CD and BCD,

This is an issue with how data is processed in the back end as well as how it is handled in the front end.

Both will need to be modified at the same time to improve this (without making things worse).

[iaincollins]

I keep pushing this one back because it's more work than a bunch of smaller improvements.

I hope to get round to it at some point!