title: How to adapt my plugin to Multisite?
body: <p>I have many plugins that I wrote for WordPress, and now I want to adapt them to MU.<br>
  What are the <em>considerations / best practices / workflow / functions / pitfalls</em> that I have to <em>follow / avoid / adapt</em> in order to 'upgrade' my plugins to support also Multisite installations? </p>
  
  <p>For example, but not limited to:</p>
  
  <ul>
  <li>Enqueue scripts/register</li>
  <li>Incuding files (php, images)</li>
  <li>Paths for custom files uploads</li>
  <li><code>$wpdb</code></li>
  <li>Activation, uninstall, deactivation</li>
  <li>Handling of admin specific pages</li>
  </ul>
  
  <p>In the Codex, there are <em>sometimes</em> remarks about Multisite in single function description, but I did not find any one-stop page that address this subject.</p>