Copies the file from to the new position to . If there is
no system function for cp, a new file will be created and the
old one copied manually in chunks of 65536 bytes.
This function can also copy directories recursively.
Returns
0 on error, 1 on success
Note
This function keeps file and directory permissions unlike in Pike 7.6 and
earlier
Module reference for Pike v7.8 release 116, 2008-12-31