Add support for preferredUsername in AP preview

                     $ photos = [photos]
                 <img src=$photos[0]["url"] style=width:100%>
             <div>
-            <p style=margin:0><big><strong>$profile["name"]</strong></big><br>
+            <p style=margin:0><big><strong>
+            $ name = profile.get("name")
+            $ preferred_username = profile.get("preferredUsername")
+            $if name:
+                $profile["name"]
+            $if name and preferred_username:
+                <small>(
+            $if preferred_username:
+                $profile["preferredUsername"]
+            $if name and preferred_username:
+                )</small>
+            </strong></big><br>
             $if "url" in profile:
                 $ urls = profile["url"]
                 $if not isinstance(urls, list):

                     <a href=$url>$url</a>
                     $if not loop.last:
                         &bull;
-                </small></p>
+                </small>
+            </p>
             <div class=profile_summary>$:profile["summary"]</div>
             $if "tag" in profile:
                 <div style=font-size:.8em>