title: JTable Multiple Header Rows
body: <p>I am using a JTable in my application and wish to have 2 rows for headings, similar to this:
  <img src="https://i.stack.imgur.com/qehz5.png" alt="Like this"></p>
  
  <p>Is this even possible or will I have to do something else? If so, what? Using Supertitle-titleA, SuperTitle-titleB will take up too much space and make information redundant.</p>