adapt belt speeds based on data set?

[Flow86]

it seems 0.15.23 changed the express belts to 40 items/s, so the hardcoded items/s values seem not to work correctly

[abrindam]

AFAIK, it's always been 40 (well, 39.99). But I think the calculations on belt speed may still be bugged. I'll take a look.

[abrindam]

Err, to be precise, since version 12 or 13 (before I started playing)

[abrindam]

See https://github.com/rubyruy/factorio-calc/commit/808040b093f56610515dff4699873bafd298c470. The values we have are in terms of one lane throughput, so we have 20 for express belts. That should be right...

[abrindam]

Welp, while trying to debug this issue I discovered #50, but I don't think that's relevant to this problem?