Add new $TABLE record to output variables

Usage

add_table_to_model(
  model,
  variables,
  firstonly = FALSE,
  file,
  reload_dataset = TRUE,
  format = "sF9.0"
)

model: pharmpy model object
variables: character vector with variable names
firstonly: add FIRSTONLY parameter to $TABLE record
file: path to file, e.g. sdtab
reload_dataset: should dataset be reloaded into the Pharmpy model object after updating the model. Default is TRUE, to ensure a proper Pharmpy model object, but can result in issues.
format: NONMEM $TABLE output format. Defaults to sF9.0, which keeps enough digits to write large integer subject IDs without truncation (NONMEM's default format truncates IDs to ~6-7 significant digits).

TODO