Change default signup admin list to use the vbo view, add first and last name fields

Marked #1024974: Add full names (last, first) to administrative signup lists as a dupe.

This adds a "cod_signup_user_vbo_admin_list" since overriding the default "signup_user_vbo_admin_list" view seemed awkward.

And here it is as a diff. I plan to commit shortly.

This is committed.

http://drupal.org/cvs?commit=488890