- allow template class to be instantiated with an empty theme (in plugins for example)

- local_head must now be defined in the themeconf.inc.php otherwise not taken into account (avoid several calls to file_exists)
- renamed themeconf['theme'] to themeconf['name'] (this is what it is themeconf[theme] is confusing)

git-svn-id: http://piwigo.org/svn/trunk@5177 68402e56-0260-453c-a942-63ccdbb3a9ee

themes/clear/themeconf.inc.php

@@ -1,6 +1,6 @@
 <?php
 $themeconf = array(
-  'theme'  => 'clear',
+  'name'  => 'clear',
   'parent' => 'default',
 );
 ?>