bplot: bplot rolling average plotting function
In swebb1/questplots: Plot functions for Quest shiny app

This function orders and bins a variable in to groups defined by a window and step size then computes rolling averages for multipe variables across each bin.

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bplot(t, x, y, ys = 1, ystep = 0, ylab = "", axis3 = "NA", w = 400,
  s = 80, f = "mean", scale = "linear", leg = "topleft", col = 1:100,
  max = "default", min = "default", feature = "data points")

`t`	Table of data.
`x`	Variable to be binned on x-axis.
`y`	Vector of variables to plot on y-axis.
`ys`	Scale the y-axis variables first. Defaults to 1.
`ystep`	Division of steps printed on y-axis scale. Defaults to 0.2.
`ylab`	Label for Y-axis. Defaults to blank.
`axis3`	Column of length variable to be plotted on 3rd axis. Defaults to "NA" (not shown).
`w`	Window size (number of values per bin). Defaults to 400.
`s`	Step size (number of values to move along for each bin). Defaults to 80.
`f`	Function to apply to y values for each bin ("mean","median","sum"). Defaults to "mean".
`scale`	Scale the x-axis ("linear"=linear spacing of points based on mean vaue of bin or "bins"=equal spacing between all bins). Defaults to "linear".
`leg`	Postion of legend. Defaults to "topleft".
`col`	Vector of colours to use in plots. Defaults to 1:100.
`max, min`	Minimum and Maximum range of y-axis.
`feature`	Name of features being binned. Defaults to "data points".