MT#5879 Config section for generate_invoices script

Squashed commit of the following:

commit 7d660fe3903c2c20926e517476d0e2e41ab69e7b
Author: Irka <ipeshinskaya@gmail.com>
Date:   Sun Aug 31 18:47:20 2014 +0300

    MT#5879 Move uniq script numbers

commit dbd2181de7f6288ba6f6692a7fe64b2257ba2ad4
Author: Irka <ipeshinskaya@gmail.com>
Date:   Thu Aug 7 14:33:38 2014 +0200

    MT#5879 Config section for generate_invoices script