* Implemented the "Play Last World" option. This
option appears on the main menu after playing
the first SP random-map game. When chosen, the
player is taken to the world chooser with the
seed filled in and all the previous settings
selected. The player can make any changes or
keep the world exactly the same. Note that if
ANY changes are made on this screen, the map
that is generated will be different. Next the
player is taken to the player setup screen with
all the civs and settings from the previous game
selected. Again, the player can make any changes
or keep the settings the same. If ANY civs are
changed, player starting locations MAY change
(depending on the number of seafaring civs,
actually).