comment and associated todo

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+`git annex unused` only looks at tags and branches. Some users would like
+to drop any objects that are not pointed to by any commit, but keep any
+object that any commit ever referenced.
+
+This could be a switch, like --ever.
+
+The implementation would need to walk the history of all branches and check
+all commits. This would tend to be slow. It could look at tags+branches as
+it does now as a first pass, and only do the slow part if there are objects
+not referred to by the tags+branches. And, it could stop looking through
+the whole commit history if there were no more objects to check. Still,
+gonna be slooow. Another optimisation would be to get only the objects
+changed by the commit, and not look at the whole tree as it appeared on
+each commit. --[[Joey]]
diff --git a/doc/walkthrough/unused_data/comment_3_5f973eb7c265015fcd400b6b0bbdf235._comment b/doc/walkthrough/unused_data/comment_3_5f973eb7c265015fcd400b6b0bbdf235._comment
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+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 3"""
+ date="2014-10-31T20:31:39Z"
+ content="""
+`git-annex unused` looks at what data is used by git branches and tags, but
+not by other commits. It's a reasonable request and I have made a todo for
+it: [[todo/find_unused_in_any_commit]] .. But I am unure if it can be
+implemented to run fast enough to be usable.
+"""]]