rt_val_hist: Plot a histogram of errors, possibly scaled by uncertainty...
In markwh/rtvalidate: Validation functions for SWOT rivertile data

Currently only implemented for node-level data

1 2	rt_val_hist(valdata, center = FALSE, scale = FALSE, curve = center && scale, vars = "all", plot = TRUE, ...)

`valdata`	data.frame as returned by codert_valdata()
`center`	Subtract the mean (bias-correct) the errors?
`scale`	Scale the errors by 1-sigma uncertainty estimates?
`curve`	Overlay a standard normal curve? This is the default if both `center` and `scale` are `TRUE`.
`vars`	Which variables to plot? Defaults to "all"
`plot`	if FALSE, return the data used to plot but do not create the plot
`...`	Passed to `geom_histogram()`