-At the end of each turn, ./savefile is written – with a list of all god commands
-necessary to recreate the current world state.
+Every fifteen seconds, if any turns have passed, ./savefile is written – with a
+list of all god commands necessary to recreate the current world state. On each
+world state change, ./server/worldstate is updated and a message "WORLD_UPDATED"
+written to ./server/out.