suptitle/suplabel for subfigures

Matlab has a useful contributed function called suptitle.m

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

    > http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=3233&objectType=file

    > 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

  http://matplotlib.sf.net/matplotlib.figure.html#Figure-text

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

JDH

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