/* Dissolves old game world if it exists, and generates a new one from "seed".
* Unlinks a pre-existing file at world.path_record if called on a world.turn>0,
* i.e. if called after iterating through an already established game world.
/* Dissolves old game world if it exists, and generates a new one from "seed".
* Unlinks a pre-existing file at world.path_record if called on a world.turn>0,
* i.e. if called after iterating through an already established game world.