convert svn: minor improvement to tag detection.
The better way is probably to list the latest tags directory and
look up the last log message for each entry. This is surprisingly
annoying to do.
adding dir/bar
adding foo
dir/bar
foo
adding dir/bar_2
adding foo_2
dir/bar_2
foo_2
adding a
adding c
adding b
adding d
removing a
removing c
recording removal of a as rename to b (100% similar)