Calculates Shape Diversity regardless of Sex without an allometry correction
zeroSShDLM.Rd
SShD is strictly non-negative, and even in the absence of sexual dimorphism, SShD will likely be positive. We can try to adjust it for SShD by calculating what SShD 'would' be in the absence of sexual dimorphism (by permuting the sexual of the individuals) and then subtracting that from SShD. Most of angler's SShD functions do this by default ('Zeroed' arguments).