amend: do not traceback on no-ops
If rewrite() generated changeset happened to be an existing one, the
call would traceback when trying to obsolete the changeset with itself.
Instead, leave gracefully, marking any intermediate changeset extinct.
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Qsync: Mercurial to MQ exporter
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People may have tools or co-worker that export to receive mutable history using
versionned mq repository.
For this purpose you can use the ``qsync`` extension:
To enable the evolve extension use::
$ hg clone http://hg-dev.octopoid.net/hgwebdir.cgi/mutable-history/
$ mutable-history/iqsync-enable.sh >> ~/.hgrc
$ hg help qsync