zoneinfo: Construct timezone abbrevs and more cleanup.
zoneinfo: Construct timezone abbrevs and more cleanup.

tgunr/factor,factor/factor,tgunr/factor,mrjbq7/factor,factor/factor,factor/factor,factor/factor,mrjbq7/factor,bpollack/factor,tgunr/factor,tgunr/factor,mrjbq7/factor,bpollack/factor,bpollack/factor,bpollack/factor,mrjbq7/factor,mrjbq7/factor,tgunr/factor,bpollack/factor,bpollack/factor,factor/factor,mrjbq7/factor,bpollack/factor,tgunr/factor,factor/factor