bash_completion: support GNU sed 3 and non-GNU sed
replaced command 'Q' introduced in GNU sed 4, in order to support
platforms with older sed.
pulling from ../a
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adding changesets
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added 1 changesets with 1 changes to 1 files
(run 'hg update' to get a working copy)
changeset: 1:9a79c33a9db3
tag: tip
user: a
date: Thu Jan 1 00:00:00 1970
summary: a
changeset: 0:01f8062b2de5
user: b
date: Thu Jan 1 00:00:00 1970
summary: b