title: Show warning/error to user without using wp_die
body: <p>I'm currently developing a Wordpress plugin. For my plugin to work I need some info te be filled in on the settings page. </p>
  
  <ol>
  <li>Is there a way to warn/throw an error so the blog admin can see this message on his/her dashboard? </li>
  <li>Is there another function to show errors other than wp_die()? Just in case my plugin (or someone else) screws up and I want to notify that in a nicely fashion. ;)</li>
  </ol>