brainfuck: some cleanup and make the ebnf simpler.
brainfuck: some cleanup and make the ebnf simpler.

slavapestov/factor,slavapestov/factor,mrjbq7/factor,bjourne/factor,sarvex/factor-lang,bpollack/factor,AlexIljin/factor,AlexIljin/factor,bjourne/factor,dch/factor,mrjbq7/factor,bpollack/factor,sarvex/factor-lang,sarvex/factor-lang,sarvex/factor-lang,bpollack/factor,mrjbq7/factor,bjourne/factor,nicolas-p/factor,sarvex/factor-lang,mrjbq7/factor,tgunr/factor,sarvex/factor-lang,bpollack/factor,bpollack/factor,nicolas-p/factor,AlexIljin/factor,bjourne/factor,AlexIljin/factor,tgunr/factor,slavapestov/factor,factor/factor,slavapestov/factor,factor/factor,bpollack/factor,dch/factor,nicolas-p/factor,slavapestov/factor,bjourne/factor,AlexIljin/factor,bjourne/factor,factor/factor,mrjbq7/factor,dch/factor,nicolas-p/factor,AlexIljin/factor,slavapestov/factor,factor/factor,nicolas-p/factor,bjourne/factor,tgunr/factor,mrjbq7/factor,nicolas-p/factor,dch/factor,tgunr/factor,slavapestov/factor,tgunr/factor,factor/factor,bpollack/factor,AlexIljin/factor,sarvex/factor-lang,nicolas-p/factor,dch/factor,factor/factor,tgunr/factor,dch/factor