Scale maximum daily intake allometrically from percentage of adult mass

[wtraylor]

There is no point in scaling forage intake differently than energy expenditure. My earlier approach to prescribe maximum daily dry-matter intake as a fixed fraction of live body mass (which is essentially an isometric scaling relationship) didn’t work. Firstly, the juveniles didn’t survive because they had not enough intake. Secondly, I had to increase the fractional daily intake for mammoth to the upper limit of what the elephant data suggested because otherwise the populations would die out. I suspect the reason for that was the isometric scaling.

Now the model will be adapted to have one instruction-file parameter for %DMI that applies to the adult male body mass. For all other body masses (for females and for young individuals), the intake will be scaled with the same allometric exponent like the metabolic rate.