* Updated to 0.23.1

0.2
* Now in a "Sell" tab factories show which goods are optional for them to run production (it's usually Energy Cells).
* Reworked optional goods - before they did nothing but was consumed anyway. Now they boost production output (but not garbage output) by 10% for each type of optional good consumed. You adjust the bonus or disable this feature in config file.
* Changed how factory founding and upgrade prices are calculated: now they both take in account 50% of a garbage output price and don't count optional goods. Because of that, you may see some prices (for example "Potato Farm") go up. But it's fair, because price is now based on the real profit.
* Improved relation checks when trading.

0.1.2
* Fixed vanilla bug - buying/selling didn't check relations.
* Fixed: Buy/sell settings didn't work for players and traders who already were approaching the station.
* Fixed: Sorting broke when player bought goods from station.
* Fixed minor issues

0.1.1
* Fixed vanilla bug - some factories had negative upgrade prices.

Had to set min/max versions for the incompatible mod.

* Incompatible with 'Station Balancing' mod.