Update 1.0.1

Just a quick patch to fix some bugs. Thanks very much to everyone who took the time to report them!

Changes

• Fixed an issue with the event selection logic that made events involving other cities appear even though there were no valid cities for them
• Fixed a related issue with the "Alliance Proposal" event
• Changed the price of grain so you now get 5 sacks for 1 parcel of goods
• Changed the values of the grain purchasing buttons and added some extra buttons to make buying large amounts less tedíous
• Fixed a couple of typos

Known issues

• There's a calculation somewhere that occasionally returns a NaN result for the population groups. I haven't been able to track it down yet, so please let me know if something like that happens to you!