Populations and Ironman Mode

[calvinke8]

Hi,

I've had some difficulty with the saves in ironman mode. When my computer turned off and your program terminated, I lost the previous data and as its ironman mode, it didnt save anything. Maybe your code could incorporate a savelog that gets amended as you go for ironman mode games specifically. This could be saved in a file so it is not lost.

Second idea,
Have a way to compare population growth by empire and by planet, maybe an option to show total growth and not be split by species.

[Akuukis]

See #49 for Total Pops chart