This function is called once at the beginning of the runtime of the tool. It checks whether there is an old logfile and renames it (if existing) to "logfile_20xx-xx-xx-xxxxxx.log". Then a new, empty, logfile "logfile.log" is created.
(Optional, String, default: "tempdir()") The absolute path to folder where the logfile will be stored.
No return value, called for side effects (see description)
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