Feature 1026 : Modify / delete comments for users

+ update config table content
 + minor modification of Sylvia theme
 + need refactoring

git-svn-id: http://piwigo.org/svn/trunk@3445 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions_user.inc.php

@@ -1197,6 +1197,21 @@ function is_adviser()
   return ($user['adviser'] == 'true');
 }
 
+/*
+ * Return if current user can edit/delete a comment
+ * @param action edit/delete
+ * @return bool
+ */
+function can_manage_comment($action, $comment_author) 
+{
+  if (!in_array($action, array('delete','edit'))) {
+    return false;
+  }
+  return (is_admin() || 
+	  (($GLOBALS['user']['username'] == $comment_author) 
+	   && $GLOBALS['conf'][sprintf('user_can_%s_comment', $action)]));
+}
+
 /*
  * Return mail address as display text
  * @return string