suptitle/suplabel for subfigures

Matlab has a useful contributed function called suptitle.m

    > that puts a central title above a set of subplots:


    > I'm planning to do a port for matplotlib, but wanted to
    > check first to see if it's a solved problem -- best, Phil

I believe this is equivalent to something like

fig.text(0.5, 0.9, 'some text')

where fig is a Figure instance. See

Exposing subtitle as a pylab function which wraps this functionality
is fine by me.




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