Fitter can now run in silent plot mode.

In fitter self._settings['autoplot'] is a list of two elements.  This is always True.  To check for plotting fitter now looks at self._settings['autoplot'][0] to see if plots should be drawn.

@jaxankey , let me know if I am missing something.  This is not a great fix but it certainly gets the job done.  I didn't look into the details of why self._settings['autoplot'] is a list of two elements.  I probably should have just spent the time to figure out why this is the case and change accordingly.  I thought this was the safest bet to not break dependent code.