checksums.common: some cleanup, remove unused stuff.
checksums.common: some cleanup, remove unused stuff.

tgunr/factor,bjourne/factor,bjourne/factor,mrjbq7/factor,tgunr/factor,bjourne/factor,bjourne/factor,AlexIljin/factor,AlexIljin/factor,mrjbq7/factor,bpollack/factor,mrjbq7/factor,bjourne/factor,factor/factor,bpollack/factor,mrjbq7/factor,bpollack/factor,factor/factor,AlexIljin/factor,AlexIljin/factor,AlexIljin/factor,AlexIljin/factor,tgunr/factor,bpollack/factor,mrjbq7/factor,bpollack/factor,bpollack/factor,bjourne/factor,factor/factor,tgunr/factor,bjourne/factor,factor/factor,factor/factor,AlexIljin/factor,mrjbq7/factor,tgunr/factor,tgunr/factor,factor/factor,bpollack/factor