Although it's by no means impossible to find decent Middle Eastern food across the city, Bristol has never really had an all-singing, all-dancing, in-your-face Lebanese restuarants until now, that is.In the past, most Lebanese Restaurants here have tended to be relatively low-key, back- street places, but Lona couldn't be more different. Occupying a huge site on Gloucester Road that used to be a Co-operative