Use ConfigParser to read/write config options
Optimization
Merge branch 'master' of git://github.com/BertrandBordage/Minecraft
Fog added to config, more optimization
Merge branch 'master' of git://github.com/BertrandBordage/Minecraft
Added save.dat and game.cfg (auto-generated if missing) to .gitignore
Moved max_trees to config file, allow to overwrite it with argument
Terrain argument is now limited to available options. Moved terrain options to a dictionary
Fix + minor cleanup.
Avoids useless random.choices.
Introduces decent tree generation.