Refreshing index takes a long time on big repositories with many files,
especially if the developer was unlucky enough to stick to a slow filesystem
or a broken OS. In this situation explicit git-update-index with
git-commit --index will speedup the workflow.
Giving either --all, -o, or -i silently turns --index off (these have to
refresh index).
In case of unmodified index no status message is shown, for all
the same reasons: it takes too long.
---

First use of new --quiet :)

 git-commit.sh |   21 +++++++++++++++++----
 1 files changed, 17 insertions(+), 4 deletions(-)
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