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Overhaul input parameters to new seed dispersal implementation in gridded mode #595

@kpalmqui

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@kpalmqui

This issue covers updating input parameters required for the new seed dispersal implementation in gridded mode. Several new inputs will be added to species.in and one input parameter will be removed. Specifically:

New inputs to add

Within species.in, for each species add three new columns.

b , definition = shape parameter, controls kurtosis and the fatness of the tail (i.e. the importance of long-distance dispersal). Set this to 1.9 in inputs.
U , definition = average wind speed, Set this to 5 in inputs.
V, definition = terminal velocity of seeds, Set this to 1.15 in inputs

Within species.in, remove column:

PMD

Also remove the following in comments in species.in:

PPTdry = ppt of a dry year (in mm)

PPTwet = ppt of a wet year (in mm)

Pmin = probability of producing seeds in a dry year

Pmax = probability of producing seeds in a wet year

HBar = The average height of an individual (centimeters).

MRS, Hmax, and Hslope should remain in species.in

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