Allow for alternate world map

[hrbrmstr]

Make it possible to use the "Wargames" map from Project Linework http://www.projectlinework.org/

[MatthewRalston]

How about support for a Gall-Peters layout??

[hrbrmstr]

split the diff and also add Hobo-Dyer? ;-)

i may have a spare cpl of cycles over t-day weekend to do this finally

[MatthewRalston]

You're kind of an inspiring programmer.