Merge branch 'es/blame-L-more'

More fixes to the code to parse the "-L" option in "log" and "blame". * es/blame-L-more: blame: reject empty ranges -L,+0 and -L,-0 t8001/t8002: blame: demonstrate acceptance of bogus -L,+0 and -L,-0 blame: reject empty ranges -LX,+0 and -LX,-0 t8001/t8002: blame: demonstrate acceptance of bogus -LX,+0 and -LX,-0 log: fix -L bounds checking bug t4211: retire soon-to-be unimplementable tests t4211: log: demonstrate -L bounds checking bug blame: fix -L bounds checking bug t8001/t8002: blame: add empty file & partial-line tests t8001/t8002: blame: demonstrate -L bounds checking bug t8001/t8002: blame: decompose overly-large test