Refactored code to make A,x,b accessors and modifiers.  Also made it so that the row picture updates every time updategraphs is called, however, it pastes a new graph on top of the old one and never destroys the old.  This needs to be fixed somehow to refresh the same old graph with new data.
updateGraphs actually updates the rowPicture every time instead of placing a whole new graph on top.  Also did some minor refactoring.