WB 2.08.x

1. some fixes in admin/users
2. some fixes in admin/pages

! update revision properties for all files
- include/Sensio/Twig remove Version 1.13.2

1. /admin/users bugfixes user deactivating and deleting

1. fixed Use of undefined constant PAGE_ID in /account/forgot.php
   ! change return value to boolean in user management delete.php, add.php
   ! change WEBSITE_SIGNATURE to WBMAIL_SIGNATURE

1. fixed output activation conformation
2. fixed deleting Users awaiting activation
   ! add YYYY-MM-DD in date_formats dropdown

! Complex code refactoring users management