plot.LevelsVsLayer: visualization of levels per layer
In adibender/rFtools: Tools for the analysis of Random Forests (and cforest)

This function visualizes frequencies of 1-, 2- and 3-categorical variables in each layer of the tree.

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plot.LevelsVsLayer(x, main = character(), col_vec = NULL, 
	type_vec = NULL, pch_vec = NULL, legend_text = NULL, xlab = "layer", 
	ylab = "relative frequency", ...)

`x`	An object of `class` LevelsVsLayer that is returned by `tableLevelsVsLayer`.
`main`	See `plot`.
`col_vec`	A `vector` with colors of length `nrow(x)`. Can be of any type accepted for `col` by `plot`. Specifies the colors of the plotted lines. Defaults to `1:3`.
`type_vec`	Same as `col`. Specifies the `type` of the plotted lines. Defaults to `"o"`.
`pch_vec`	Same as `col`. Specifies the `pch` of the points, if `type = "o"`. Defaults to `4`.
`legend_text`	The `legend` argument of the `legend` function.
`xlab, ylab`	Arguments passed to `plot`.
`...`	Further arguments passed to `plot`.