Modified the -m command so that it doesn't default to the Experiment stack unless no ports are given. This allows it to be used on other stacks without passing the -S option. There are probably other commands that should get this treatment, but being conservative for now.
Modified the -m command so that it doesn't default to the Experiment
stack unless no ports are given. This allows it to be used on other
stacks without passing the -S option. There are probably other commands
that should get this treatment, but being conservative for now.

Also improved the debugging output from commands that complain about
multiple stacks.

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome