Updates to Steady state module

- Return profile reduction ratio in debug mode when using RCM.
Do we have an example on how to use the logging module?

Robert Johansson wrote:
>
> In qutip/steadystate.py:
>
> > print('RCM bandwidth:', rcm_band)
> > print('Bandwidth reduction factor:', round(
> > old_band/rcm_band, 1))
> > + print('Profile reduction factor:', round(
>
> OK I see, that makes sense. The logging module should still be
> relevant for this though.
>
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> <https://github.com/qutip/qutip/pull/250/files#r20555043>.