* objcopy.c: Add --interleave-width option to allow interleaving

    * objcopy.c: Add --interleave-width option to allow interleaving
        of more than one byte at a time.
        (copy_width): New variable.
        (copy_options): Add --interleave-width.
        (copy_section): When interleaving copy in units of copy_width
        bytes.
        (copy_main): Parse the new option.
        * doc/binutils: Document the new option.
        * NEWS: Mention the new feature.

        * binutils-all/objcopy.exp: Add test of new --interleave-width
        option.