Average Prices Tooltip

This mod adds an "Average Price" tooltip to the station (inventory) trader menu.

It replaces the default menu_trader_inventory.lua (and .xpl) file due to the current Lua issue and will thus be incompatible with any other mod that replaces the menu_trader_inventory.* files (that means changes to the menu itself, not the wares).

Any modders who might want to replace those files as well are welcome to add my minor change to theirs if the wish. I'd appreciate it if they give me credit but it's not a requirement.

I'll try to revisit this mod once Egosoft sort out the "_G is nil" issue as I have a few ideas to expand on this mod (basically make it a feature you get from a crafted item in your inventory) but I don't think I'll have a lot of time available to do so any time soon.

Apologies if my English is not up to scratch; it's late and I'm a tad (too) inebriated... :P