Modifies .Last() to call 'finalizeSession() before calling the default .Last() function.
Note that .Last() is not guaranteed to be called when
  the R session finished.  For instance, the user may quit R by calling
  quit(runLast=FALSE) or run R in batch mode.
Note that this function is called when the R.utils package is loaded.
# S3 method for default
addFinalizerToLast(...)Not used.
Returns (invisibly) TRUE if .Last() was modified,
  otherwise FALSE.