Function to run data processing scripts.
prep_dat(rebuild=FALSE, overwrite, pkgdir)
logical indicating whether the entire database should be rebuild (default is
character vector with one or more
.Rd filenames to overwrite (if they already exist). The default is to never overwrite any existing
character string specifying the root directory of the source package (if unspecified, the current working directory is assumed to be the package root directory).
The function is only for used for processing new datasets for inclusion in the package. It should be used as described on the metadat-package help page.