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When a daemon or the controller emits a "show_help" message,
we want it to go to any attached tools that request the
STDDIAG channel. In addition, we want it to output to stderr
if the user has requested that we do so. In the case of output
to the local screen, ensure it only comes once.
While we are at it, fix the "unable to launch daemons" message
so it includes the case of unresolved nodenames.
Refs #1316
Signed-off-by: Ralph Castain rhc@pmix.org