[PATCH v4 00/15] complete reroll of my "port rebase -i to C" series

So unlike previous series, this is a complete reroll of all my previous patches to port rebase -i to C using code from the sequencer project.

The main changes are in the commit messages that I tried to improve according to Junio's feedback. But some patches were also squashed together and there are a few minor changes too:

- comments have been added before the pick_commit() function (patch
11/15: revert: libify cherry-pick and revert functionnality),

- and a line in the usage message as been removed from patch 13/15
(sequencer: add "do_commit()" and related functions) because it should
be added by the next patch instead.

Christian Couder (9):
  sequencer: add "builtin-sequencer--helper.c"
  rebase -i: use "git sequencer--helper --make-patch"
  sequencer: add "--reset-hard" option to "git sequencer--helper"
  rebase -i: use "git sequencer--helper --reset-hard"
  sequencer: add "--fast-forward" option to "git sequencer--helper"
  sequencer: let "git sequencer--helper" callers set "allow_dirty"
  rebase -i: use "git sequencer--helper --fast-forward"
  pick: libify "pick_help_msg()"
  rebase -i: use "git sequencer--helper --cherry-pick"

Stephan Beyer (6):
  sequencer: add "make_patch" function to save a patch
  sequencer: add "reset_almost_hard()" and related functions
  sequencer: add "do_fast_forward()" to perform a fast forward
  revert: libify cherry-pick and revert functionnality
  sequencer: add "do_commit()" and related functions working on
    "next_commit"
  sequencer: add "--cherry-pick" option to "git sequencer--helper"

 .gitignore                  |    1 +
 Makefile                    |    3 +
 builtin-revert.c            |  293 ++++--------------------
 builtin-sequencer--helper.c |  543 +++++++++++++++++++++++++++++++++++++++++++
 builtin.h                   |    1 +
 git-rebase--interactive.sh  |   42 ++--
 git.c                       |    1 +
 pick.c                      |  240 +++++++++++++++++++
 pick.h                      |   14 ++
 9 files changed, 865 insertions(+), 273 deletions(-)
 create mode 100644 builtin-sequencer--helper.c
 create mode 100644 pick.c
 create mode 100644 pick.h