Update on Wealth and Shipping

Started to write some thoughts about the trade system for dealing with commodities.  I've been stuck with thinking about how it might work, and realized that, instead of trying to think it into place, I need to come up with a rough draft for it, and see how it works and where it breaks, and then revise as appropriate.  But I'm not going to come up with the perfect system on the first pass.  So this is an initial, rough, almost certainly broken system. But let's see where it breaks, and what might make it better.

The new file is dated 2022-07-10