The loop over m

Cannot use 
for m in range(m_min, m_max, dm):
because range works with integers only
A while-loop is appropriate: 
m = m_min
while m <= m_max:
    case = "tmp_m_%g" % m
    s = "python simviz1.py %s -m %g -case %s" % \
        (simviz1_options,m,case)
    os.system(s)
    m += dm
(Note: our -m and -case will override any -m or -case option provided by the user)

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