New: AutoSell Production Option.

This feature can be turned on/off with allowAutoSellProduction in options.cfg.
Default is OFF!
It can be activated with a right-click on the UP-arrow-button when assigning "Total to Produce" on the Manufacture-screen. Its state is showed by $$$. When a new item is built, it will be sold immediately. The time-left column on the Manufacture-screen shows the time left to complete one new item.