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Industry Production Levels v1.2.1

Patches all industries to have multiple production levels to allow them to auto-upgrade up or down as needed to match supply and demand. Default setting allows for 7 production levels where each level is double the previous level: 100, 200, 400, 800, 1600, 3200, 6400
Both the number of levels (7) and the base production value (100) can be modified if desired, and separate configuration is available for each class of industry: Producing (e.g. Coal Mine), Transforming (e.g. Steel Mill), Consuming (e.g. Power Plant).
Configuration is saved per-savegame and can be adjusted when loading the game: Main Menu > Load Game > Select Options > highlight "Industry Production Levels" > choose options in right panel.

Note: to get around some game-crashing quirks due to hardcoded values I have had to included a patched version of industryutil.lua which is not ideal (would conflict with any other mods that also replace that file, and could break if/when a new official patch changes the file until I merge the changes) but I cannot see any way around it. If someone has suggestions how to avoid this let me know.