Update menu callbacks to use new ds menu constants
- Minor update to bring VD in line with changes in Display Suite 2.0 - Tidy help text
- by stalski: Refactored vd titles using the handler object.
Release notes on http://drupal.org/node/857512
See http://drupal.org/node/792476
See http://drupal.org/node/772340
Development preview of Views displays