Rescales the horizontal axes to make the lengthscales equal.

def rescaleX(self):
        '''Rescales the horizontal axes to make the lengthscales equal.'''
        self.ratio = self.figure.get_size_inches()[0]/float(self.figure.get_size_inches()[1])
        self.axes.set_xlim(-self.ratio,self.ratio)
        self.axes.set_ylim(-1,1)