merge r6437 from trunk to branch 2.1

- do not remove slashes before calling insert_user_comment (homogeneity with update_user_comment and general use of slashes in piwigo)
- when using a modifier on a non array variable use @| instead of | (generated code is simpler and faster)

git-svn-id: http://piwigo.org/svn/branches/2.1@6438 68402e56-0260-453c-a942-63ccdbb3a9ee

include/picture_comment.inc.php

@@ -46,8 +46,8 @@ if ( $page['show_comments'] and isset( $_POST['content'] ) )
   }
 
   $comm = array(
-    'author' => trim( stripslashes(@$_POST['author']) ),
-    'content' => trim( stripslashes($_POST['content']) ),
+    'author' => trim( @$_POST['author'] ),
+    'content' => trim( $_POST['content'] ),
     'image_id' => $page['image_id'],
    );
 
@@ -237,7 +237,7 @@ SELECT
     $content = '';
     if ('reject'===@$comment_action)
     {
-      $content = htmlspecialchars($comm['content']);
+      $content = htmlspecialchars( stripslashes($comm['content']) );
     }
     $template->assign('comment_add',
         array(