Checklist improvements

Two improvements for the Checklist function:

  1. Add a link to the checklist on the site to the notification email. Otherwise it’s too hard to find that item in the site.
  2. Option to create a Checklist from all campout participants. The goal here is to be able to have tasks for all scouts for a campout (e.g. complete a waiver, order summer camp tshirts, bring your Medical Form C).