parseTsrg2
forge TSRG2 ("tsrg2 left right": col0=left=SRG runtime, col1=right=named; space-separated columns, tab-indented members) -> named->srg. Which member rows survive is recordTsrg2Member's call.
forge TSRG2 ("tsrg2 left right": col0=left=SRG runtime, col1=right=named; space-separated columns, tab-indented members) -> named->srg. Which member rows survive is recordTsrg2Member's call.