Add ross's request in #6525
Add ross's request in #6525

- make sure ‘duplicate set’ button is disabled when max repeaters are
reached
- make sure ‘delete set’ button is disabled when minimum is reached
bolt/bolt,Intendit/bolt,bolt/bolt,electrolinux/bolt,electrolinux/bolt,GawainLynch/bolt,nikgo/bolt,nikgo/bolt,bolt/bolt,lenvanessen/bolt,nikgo/bolt,Intendit/bolt,Intendit/bolt,romulo1984/bolt,GawainLynch/bolt,bolt/bolt,lenvanessen/bolt,Intendit/bolt,lenvanessen/bolt,electrolinux/bolt,lenvanessen/bolt,GawainLynch/bolt,nikgo/bolt,romulo1984/bolt,electrolinux/bolt,romulo1984/bolt,romulo1984/bolt,GawainLynch/bolt