Re: [PATCH v4 7/8] rebase --abort: improve reflog message

> From: Phillip Wood <phillip.wood@dunelm.org.uk>
>
> When aborting a rebase the reflog message looks like
>
> 	rebase (abort): updating HEAD
>
> which is not very informative. Improve the message by mentioning the
> branch that we are returning to as we do at the end of a successful
> rebase so it looks like.
>
> 	rebase (abort): returning to refs/heads/topic
>
> If GIT_REFLOG_ACTION is set in the environment we no longer omit
> "(abort)" from the reflog message. We don't omit "(start)" and
> "(finish)" when starting and finishing a rebase in that case so we
> shouldn't omit "(abort)".