sequences.extras: adding find-last-index.
sequences.extras: adding find-last-index.

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