SA: option for custom outputs

[PavelBal]

SA should support other outputs than PK-parameters only.

How? Proposal - the user provides a function with well-defined signature and returns a value. E.g.:

customSAOuput <- function(simulationResults, outputPath) {
  tmp <- simulationResults$data$outputPath
  # do some magic
  result <- magic(tmp)
  return(result)
}

Checks to perform:

• function signature is SimulationResults, string

[PavelBal]

Name of the function must be considered for the title in plots (and table outputs)

[Laura-Villain]

Example: average of tmp between times X and Y (ex: mean tmp between time=10 min and time =60 min)

[PavelBal]

When implemented, update the plotting functions.

• Update documentation
• Add customOutputs argument

[rengelke]

Resolved in #685