[PATCH v10 0/7]Finish converting git bisect to C part 2 subset 2

These patches correspond to a second part of patch series of Outreachy project "Finish converting `git bisect` from shell to C" started by Pranit Bauva and Tanushree Tumane (https://public-inbox.org/git/pull.117.git.gitgitgadget@gmail.com) and continued by me.

This patch series version is composed by the last seven patches of part2 set.

These patch series emails were generated from: https://gitlab.com/mirucam/git/commits/git-bisect-work-part2-v10-subset2.

I would like to thank Johannes Schindelin for reviewing this patch series and to Christian Couder for his advice and help.

General information -------------------

* Rebased on d4a392452e (Git 2.29-rc1, 2020-10-08) to build with latest
changes in bisect--helper.c file.

Specific changes ----------------

[1/7]bisect--helper: finish porting `bisect_start()` to C

* Add comment in commit message related with `eval` command.
* Remove code comment that does not apply anymore.

---

[4/7]bisect--helper: reimplement `bisect_state` & `bisect_head` shell
    functions in C
    
* Add comment in commit message related with `eval` command.
* Change some code to convert shell command more faithfully.
* Add call to bisect_autostart() in bisect_state().
* Amend error message.
    
---

Pranit Bauva (7):
  bisect--helper: finish porting `bisect_start()` to C
  bisect--helper: retire `--bisect-clean-state` subcommand
  bisect--helper: retire `--next-all` subcommand
  bisect--helper: reimplement `bisect_state` & `bisect_head` shell
    functions in C
  bisect--helper: retire `--check-expected-revs` subcommand
  bisect--helper: retire `--write-terms` subcommand
  bisect--helper: retire `--bisect-autostart` subcommand

 builtin/bisect--helper.c | 185 +++++++++++++++++++++++----------------
 git-bisect.sh            |  81 ++---------------
 2 files changed, 115 insertions(+), 151 deletions(-)