circ_boxplot: Draw boxplot
In markheckmann/circplot: Draw graphical elements in circular way

Functions calculates medians using the quantile function from the circular package.

1 2	circ_boxplot(x, label = NA, height = 1, cex = 0.7, col = grey(0.95), probs = seq(0, 1, 0.25), ...)

`x`	Data from original range.
`label`	A label next to the outer whisker.
`height`	The height within a ring.
`cex`	numeric character expansion factor; multiplied by `par("cex")` yields the final character size. `NULL` and `NA` are equivalent to `1.0`.
`col`	Filling of box.
`...`	Passed on to `polygon`.

# simple boxplot
x <- c(0.06, 0.1, 0.19, 0.9, 0.1, 0.1, 0.07)
circ_plot()
circ_par_init()
ring_set(1)
circ_points(x, .5 , col="red", pch=16)
ring_set(2)
circ_boxplot(x)