Merge branch 'es/blame-L-more'

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