title: Use vs Import vs Require vs Require-extension in Chicken Scheme
body: <p>I'm a little hazy on the differences between <code>(use)</code> and <code>(import)</code> in Chicken. Similarly, how do <code>(load)</code>, <code>(require)</code> and <code>(require-extension)</code> differ?</p>
  
  <p>These things don't seem to be mentioned much on the website.</p>