Bug fixes and minor changes

- fixed one bug causing crashes - fixed free technology and culture upgrades in countries without cities glitch - fixed one save loading bug – some corrupted saves should work now - the AI should not declare wars now in ''no aggression'' mode at all - seeing that many players dislike current aggressiveness system I have decided to add an option to regulate aggressiveness gain modifier – hope you enjoy!

Dear users, thank you for all support in recent days, thanks to you I can continue development of this game. I would like to inform you, that for now I am going to keep working on small updates focused on fixing bugs, especially those causing crashes. I hope soon I'll be able to start adding new content. Have a great time with Nations!