[cups] Two-sided printing and copies

[Narcis Garcia]

Hello, and thanks to everybody who shares knowledge and work.

I've recently configured a "Brother MFC-9140CDN" to a Debian GNU/Linux 8
system installing drivers from brother.com and setting Two sided
printing ("Long-edge binding") for all documents. It works.

The problem comes when printing 2+ copies of same document: p.e. 3 page
document with LibreOffice Writer -> print -> Copies=2

Expected result for the example:
1st paper two-sided (pages 1,2)
2nd paper single-sided (page 3)
3rd paper two-sided (pages 1,2)
4th paper single-sided (page 3)

Ontained result for same example:
1st paper two-sided (pages 1,2)
2nd paper two-sided (pages 3,1)
3rd paper two-sided (pages 2,3)

This really saves more paper, but user cannot deliver each copy to
different person.