plotResidualsCM: Plot concentration or flux residuals.
In McDowellLab/loadflex: Models and Tools for Watershed Flux Estimates

Not sure we want to include this function in the official API, so keeping it internal for now.

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plotResidualsCM(type, load.model, observations, resids, dateField = "Date",
  verbose = FALSE, xObservations = FALSE, xFlow = FALSE,
  day.of.year = FALSE)

`load.model`	use this to pull names of date column and constituent name
`observations`	these are the observations to plot the residuals for
`dateField`	name of the date field in observations
`verbose`	debugging flag
`day.of.year`	flag if true will plot residuals by the day of year to,
`residuals`	the observation residuals