title: How can I enable inline ManyToManyFields on my Django admin site?
body: <p>Let's say I have Books and Author models.</p>
  
  <pre><code>class Author(models.Model):
      name = CharField(max_length=100)
  
  class Book(models.Model):
      title = CharField(max_length=250)
      authors = ManyToManyField(Author)
  </code></pre>
  
  <p>I want each Book to have multiple Authors, and on the Django admin site I want to be able to add multiple new authors to a book from its Edit page, in one go. I don't need to add Books to authors.</p>
  
  <p>Is this possible? If so, what's the best and / or easiest way of accomplishing it?</p>