Good selection method
Based on https://osdn.net/projects/freeciv/ticket/47653#comment:12505:47653:1686983104, inspired by bard's comments:
Ruleset should have some more control over the way Good carried over the trade route gets selected.
I think this would be handy, even if it is just an integer of priority
Backporting this to S3_2 would take some effort, so retargeting to 3.3.
Based on https://osdn.net/projects/freeciv/ticket/47653#comment:12505:47653:1686983104, inspired by bard's comments:
Ruleset should have some more control over the way Good carried over the trade route gets selected.