Small change

I've updated the game to get the hydrogen power plant back in action, it was missing from the building menu. I've also done a small change to trade to remove a constraint where selling items would max out at 100 per time tick. This was an old constraint based on how trade used to function. Since I seperated in/outgoing human traffic by adding a distrinct goods transfer capacity type along with a goods port building, this constraint no longer made any sense. So now the amount of goods you can ship and receive depends on the capacity of the city, ie. how many goods ports you have (atmoports add a bit too, but not nearly as much).

Updates have been slow this year, primarily due to an insane work load as well as having spent most of the first four months of the year being ill. I also moved in november and just recently got everything properly set up. I'm hoping development of the remainder of the game will pick up! The todo list as far as new stuff is fairly small now after all, so most of what remains is polish, polish and more polish. :)

/ Nick