bbi_init: Executes ('bbi init') with bbi_exec() in specified directory
In metrumresearchgroup/mrgvalidatetestreference: Test reference for mrgvalidate

Executes ('bbi init') with bbi_exec() in specified directory

bbi_init(
  .dir,
  .nonmem_dir,
  .nonmem_version = NULL,
  .no_default_version = FALSE
)

`.dir`	Path to directory to run 'init' in (and put the resulting 'babylon.yml' file)
`.nonmem_dir`	Path to directory with the NONMEM installation.
`.nonmem_version`	Character scaler for default version of NONMEM to use. If left NULL, function will exit and tell you which versions were found in '.nonmem_dir'
`.no_default_version`	Boolean to force creation of babylon.yaml with NO default NONMEM version. FALSE by default, and not encouraged.