- replaced tons of tabs with spaces

- replaced <? with <?php for compatibility sake (see TODO and CODING_STANDARD to know more)
- improved overall code lisibility

preferences.php

@@ -1,4 +1,4 @@
-<?
+<?php
     
 include("path.php");
 include(BASE."include/"."incl.php");
@@ -96,7 +96,7 @@ build_prefs_list();
 
 echo html_table_end();
 echo html_frame_end();
-echo "<br> <div align=center> <input type=submit value='Update'> </div> <br>\n";
+echo "<br /> <div align=center> <input type=submit value='Update'> </div> <br />\n";
 echo "</form>\n";