Co-production of surfactin and a novel bacteriocin by Bacillus subtilis subsp. subtilis H4 isolated from Bikalga, an African alkaline Hibiscus sabdariffa seed fermented condiment by Compaoré, Clarisse S., Nielsen, Dennis S., Ouoba, Irene, Berner, Torben S., Nielsen, Kristian F., Sawadogo-Lingani, Hagrétou, Diawara, Bréhima, Ouédraogo, Georges A., Jakobsen, Mogens, Thorsen, Line