The default value of rm = FALSE is to protect users from accidental
loss of work, but the TAF server always runs with rm = TRUE to make
sure that only files, not objects, are carried over between scripts.
Likewise, the TAF server runs with clean = TRUE to make sure that the
script starts with a clean directory. The target directory of a TAF script
has the same filename prefix as the script: data.R creates data
etc.