title: Instead of grid lines on a plot, can matplotlib print grid crosses?
body: <p>I want to have some grid lines on a plot, but actually full-length lines are too much/distracting, even dashed light grey lines. I went and manually did some editing of the SVG output to get the effect I was looking for. Can this be done with matplotlib? I had a look at the pyplot api for grid, and the only thing I can see that might be able to get near it are the xdata and ydata Line2D kwargs. </p>
  
  <p><img src="https://i.stack.imgur.com/ds08F.png" alt="enter image description here"></p>