merge: allow reading the merge commit message from a file
This is consistent with `git commit` which, like `git merge`, supports passing the commit message via `-m <msg>` and, unlike `git merge` before this patch, via `-F <file>`. It is useful to allow this for scripted use, or for the upcoming patch to allow (re-)creating octopus merges in `git rebase --rebase-merges`. Signed-off-by: NJohannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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