Removed unnecessary ARIA "form" role on native HTML form elements.

This fixes warnings reported by W3C Nu Html Checker
(https://validator.w3.org/nu/).

htroot/Crawler_p.html

@@ -79,7 +79,7 @@
         </tbody>
       </table>
       #(terminate-button)#::
-      <form action="/Crawler_p.html" method="get" role="form">
+      <form action="/Crawler_p.html" method="get">
             <input type="hidden" name="queues_terminate_all" value="" />
             <button type="submit" class="btn btn-danger" onclick="return confirm('Confirm Termination of All Crawls')"><span class="glyphicon glyphicon-remove-circle"></span> Terminate All</button>
       </form>

htroot/env/templates/header.template

@@ -23,14 +23,14 @@
     <div class="navbar-collapse collapse">
       <ul class="nav navbar-nav navbar-right">
         <li id="header_restart">
-          <form action="/Steering.html" method="get" role="form">
+          <form action="/Steering.html" method="get">
             <input type="hidden" name="restart" value="" />
             <button accesskey="s" type="submit" class="btn btn-inverse navbar-btn label-warning" onclick="return confirm('Confirm Re-Start')"><span class="glyphicon glyphicon-fire"></span> Re-Start</button>
           </form>
         </li>
         <li>&nbsp;</li>
         <li id="header_shutdown">
-          <form action="/Steering.html" method="get" role="form">
+          <form action="/Steering.html" method="get">
             <input type="hidden" name="shutdown" value="" />
             <button accesskey="s" type="submit" class="btn btn-inverse navbar-btn label-danger" onclick="return confirm('Confirm Shutdown')"><span class="glyphicon glyphicon-off"></span> Shutdown</button>
           </form>
@@ -50,7 +50,7 @@
         </ul>
         </li>
         <li id="header_administration">
-          <form action="/index.html" method="get" role="form">
+          <form action="/index.html" method="get">
             <button accesskey="s" type="submit" class="btn btn-inverse navbar-btn label-primary"><span class="glyphicon glyphicon-search"></span> Search Interface &raquo;</button>
           </form>
         </li>

htroot/env/templates/simpleheader.template

@@ -49,7 +49,7 @@
         </ul>
       </li>
       <li id="header_administration">
-        <form action="/Status.html" method="get" role="form">
+        <form action="/Status.html" method="get">
           <button accesskey="s" type="submit" class="btn btn-default navbar-btn"><span class="glyphicon glyphicon-cog"></span> Administration &raquo;</button>
         </form>
       </li>

htroot/test.html

@@ -58,7 +58,7 @@
               </ul>
             </li>
             <li id="header_administration">
-              <form action="/Status.html" method="get" role="form">
+              <form action="/Status.html" method="get">
                 <button accesskey="s" type="submit" class="btn btn-inverse navbar-btn">Administration &raquo;</button>
               </form>
             </li>