Autodoc: Use $imagedir$ rather than $dotdot$/images/ in the modref template.

Fixes broken images when the images directory has been relocated.

refdoc/structure/modref.html

@@ -10,24 +10,24 @@
     <td colspan='2' align='right'>Extracted from $version$ at $date$.</td>
   </tr>
   <tr>
-    <td width="0%"><img src="$dotdot$/images/unit.gif" alt="" width="10" height="1"></td>
+    <td width="0%"><img src="$imagedir$unit.gif" alt="" width="10" height="1"></td>
     <td width="1%">
-      <a href="http://pike.lysator.liu.se/"><img src="$dotdot$/images/pike_logo.gif"
+      <a href="http://pike.lysator.liu.se/"><img src="$imagedir$pike_logo.gif"
       border="0" alt="pike.lysator.liu.se" width="181" height="41" hspace="5"></a></td>
-    <td width="0%"><img src="$dotdot$/images/unit.gif" alt="" width="10" height="1"></td>
+    <td width="0%"><img src="$imagedir$unit.gif" alt="" width="10" height="1"></td>
     <td width="99%">
       <table align="center" border="0" width="100%" cellspacing="0" cellpadding="0" valign="middle">
         <tr>
-          <td width="1%" align="right"><img src="$dotdot$/images/pike_line_left.gif" alt="" border="0" width="5" height="11"></td>
-          <td background="$dotdot$/images/pike_line_middle.gif" width="98%"><img src="$dotdot$/images/unit.gif" alt="" border="0" width="11" height="11"></td>
-          <td width="1%" align="left"><img src="$dotdot$/images/pike_line_right.gif" alt="" border="0" width="5" height="11"></td>
+          <td width="1%" align="right"><img src="$imagedir$pike_line_left.gif" alt="" border="0" width="5" height="11"></td>
+          <td background="$imagedir$pike_line_middle.gif" width="98%"><img src="$dotdot$/$imagedir$unit.gif" alt="" border="0" width="11" height="11"></td>
+          <td width="1%" align="left"><img src="$imagedir$pike_line_right.gif" alt="" border="0" width="5" height="11"></td>
         </tr>
       </table>
     </td>
-    <td width="0%"><img src="$dotdot$/images/unit.gif" alt="" width="10" height="1"></td>
+    <td width="0%"><img src="$imagedir$unit.gif" alt="" width="10" height="1"></td>
   </tr>
   <tr>
-    <td colspan="5"><img src="$dotdot$/images/unit.gif" alt="" width="1" height="10"></td>
+    <td colspan="5"><img src="$imagedir$unit.gif" alt="" width="1" height="10"></td>
   </tr>
 </table>