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