Add BB tracers

Signed-off-by: Katherine Travis <ktravis@login04.as.harvard.edu>
Merge branch 'master' of https://github.com/kim-at-last/RunDirectory

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
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Restarts for anyone who wants all the tracers

Signed-off-by: Katherine Travis <ktravis@login04.as.harvard.edu>