dgvm3d.options: set some variables used in cascading functions
In DGVM3D: 3D Forest Simulation Visualization Tool

set some variables used in cascading functions

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dgvm3d.options(x = NULL, patch.area = NULL, samples = NULL,
  overlap = NULL, sort.column = NULL, establish.method = NULL,
  color.column = NULL, verbose = NULL)

`x`	query character 'x' for its value.
`patch.area`	the patch area in m^2.
`samples`	2 element vector. 1. number of samples to determine the next trees position. 2. max. number to repeat the sampling
`overlap`	fraction of crownradius allowed to overlap.
`sort.column`	2 element vector: 1. vegetation data.frame culumn name to sort by. 2. "descending" (default) or "ascending".
`establish.method`	where to place the trees: 'random', 'sunflower' or 'row'. If there are trees with positions already 'random' is applied.
`color.column`	name of the vegetation column to create the canopy colors from.
`verbose`	print some information.