"Fantails" set to the proper height.
Random sounds are set properly (thanks to D'lanor for helping me work it out).
Collisions are streamlined.
Excess vertices purged.
Some mushrooms are cleared away.
Additional mini-islands added.
Classification notebook updated with Tweek's observations.
Fens is (almost) ready (again
)! Version 4.x only needs a couple additions and it will be sent to the Maintainers for proofing.