To do #1077
User story #1076: Improve navigation in Scrum views
Add back links
- Add back links in Scrum links.
- Add new tip when the project hasn't defined members & the user is trying to edit the Sprint effort for no members.
git-svn-id: https://svn.ociotec.com/Software/Web/Redmine/plugins/scrum/trunk@1835 1633e602-76eb-4acd-8a1c-850ebfcfe024