title: Adjust padding/figure margins in gridspec
body: <p>My subplots are positioned somewhat oddly within the figure. There is heaps of room on the top, bottom and left, which I don't need, but the right margin is coming a bit too close to the right axis label. See the example.<a href="https://i.stack.imgur.com/5820n.png" rel="noreferrer"><img src="https://i.stack.imgur.com/5820n.png" alt="The example figure with grey background to see the padding"></a></p>
  
  <p>The code I generated it with is below. Please note I used tight_layout as well as subplots_adjust and neither of them worked.</p>
  
  <pre><code>fig = plt.figure(figsize=(7.5,10.))
  fig.patch.set_facecolor('silver')
  gs = gridspec.GridSpec(3,2,hspace=0.4,wspace=0.1)
  
  ax1 = plt.subplot(gs[:,0])
  a1 =  plt.plot(x, y, linestyle='-',color='b')
  a1 = plt.ylabel('Y')
  a1 = plt.ylim(zmax[c],zmin[c])
  a1 = plt.xlabel('X')
  a1 = plt.xticks([np.around(min(x),2),np.around(min(x)/2,2),0,np.around(max(x)/2,2),np.around(max(x),2)])
  a1 = plt.title('(a)',fontsize=12)  
  
  ax2 = plt.subplot(gs[0,1])
  a2 = plt.plot(x2,y2, linestyle='',marker='o',color='b' )
  a2 = plt.ylabel('value')
  ax2.yaxis.tick_right()
  ax2.yaxis.set_ticks_position('both')
  ax2.yaxis.set_label_position("right")
  a2 = plt.xlabel('number')
  a2 = plt.title('(b)',fontsize=12) 
  
  ax3 = plt.subplot(gs[1,1])
  a3 = plt.plot(x3,y3, linestyle='--',color='b')
  a3 = plt.ylabel('another y')
  ax3.yaxis.tick_right()
  ax3.yaxis.set_ticks_position('both') 
  ax3.yaxis.set_label_position("right")
  a3 = plt.xlabel('x')
  a3 = plt.title('(c)',fontsize=12) 
  
  ax4 = plt.subplot(gs[2,1])
  a4 = plt.plot(x4,y4, linestyle='--',color='b')
  a4 = plt.ylabel('y')
  ax4.yaxis.tick_right()
  ax4.yaxis.set_ticks_position('both')
  ax4.yaxis.set_label_position("right")
  a4 = plt.xlabel('x')
  a4 = plt.title('(c)',fontsize=12) 
  
  plt.suptitle('Title', fontsize=12,y=0.95)
  plt.subplots_adjust(left=0, bottom=0, right=1, top=0, wspace=0, hspace=0)
  #fig = plt.tight_layout()
  plt.show()
  </code></pre>
  
  <p>The question is: how can I increase the right margin while narrowing the other margins and preserving the padding between the subplots?</p>