patch, 4 partsbisect--helper: fix reading many paths

These patches fix reading more than one path in "git bisect--helper":

  quote: implement "sq_dequote_many" to unwrap many args in one string
  quote: add "sq_dequote_to_argv" to put unwrapped args in an argv
    array
  bisect: fix reading more than one path in "$GIT_DIR/BISECT_NAMES"
  bisect: test bisecting with paths

 bisect.c                    |   14 +++++-----
 quote.c                     |   35 +++++++++++++++++++++++-
 quote.h                     |   10 +++++++
 t/t6030-bisect-porcelain.sh |   60 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 110 insertions(+), 9 deletions(-)