sequences.extras: add filter-all-subseqs, filter-all-subseqs-range, map-like
sequences.extras: add filter-all-subseqs, filter-all-subseqs-range, map-like

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