copyDirectory: Copies a directory
Description
 Copies a directory.
Usage
"copyDirectory"(from, to=".", ..., private=TRUE, recursive=TRUE)
Arguments
from
The pathname of the source directory to be copied.
to
The pathname of the destination directory.
...
Additional arguments passed to
    file.copy(), e.g. overwrite. private
If TRUE, files (and directories) starting with
        a period is also copied, otherwise not. recursive
If TRUE, subdirectories are copied too,
        otherwise not. Details
  Note that this method does not use copyFile() to
  copy the files, but file.copy().