Define file structure for Gameboard

We want to be able to save data for a gameboard to file. So that someone can make maps (called gameboard in the code) and save them. We could also then have a visual map editor separate from the current game client and server code.

The basics of what are needed is pretty simple. Maximum lat and long, elevations... The movement penalties to each tile, etc... The complicated part comes in not from the game engine, but the art actually. How to store that is an interesting question.
- Maybe XML?
- Plain whitespace separated text?