Re: [GSoC][PATCH v3 11/13] rebase--interactive: remove unused modes and functions

Alban Gruin [off-list ref] writes:

This removes the modes `--skip-unnecessary-picks`, `--append-todo-help`,
`--checkout-onto`, `--shorten-ids` and `--expand-ids` from
rebase--helper.c, the functions of git-rebase--interactive.sh that were
rendered useless by the rewrite of complete_action(), and
append_todo_help_to_file() from rebase-interactive.c.

Good.  So far up to this step, I thnk the organization of the series
looks good, even if the execution in each individual step we have
seen previously may still need to be improved.