ROUTINE
-------

INT_ ug_copy_argv (char **argv, char ***new_argv)

DESCRIPTION
-----------

Make a copy of the argument vector.

INPUT ARGUMENTS
---------------

argv     : Existing argument vector.

RETURN VALUE
---------------

0        : No errors occurred.
>0       : Errors occurred.
           The return value will be between 400 and 499 or
           the return value will be between 100400 and 100499

OUTPUT ARGUMENTS
---------------

new_argv : New argument vector.
