Adds buttons for changing the displayed plot suite
Adds buttons for changing the displayed plot suite

 - make the gridspec object a data member of the ExpandingWindow class
   so that it is accessible later
 - change gridspec so as to have a place for another group of buttons
   (this made the buttons look better too)
 - add function for changing the buttons style slightly.
 - add setup for the "suite changer" buttons
 - add function that changes suites

Issues:
 - There is a some duplicate code between the ctor for the
   ExpandingWindow.py class and the suitechanger() function.
   Would be nice to consolidate this...
 - Not sure if accessing the globally scoped configured_suites object is
   bad practice?

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