Roadmap and Release 2.8.1

Detailed Changelog: For users: - Fix: Works on database with _ in name. - Fix: Broken feature in trips and expense module. - Fix: Can use $ in database and login/pass values. - Fix: No error on upgrade if there is orphelins tasks. - Fix: Failed to login when user agent string was longer than 128. - Fix: bug #29526 : Numérotation Proposition Incorrecte après duplication
 * ChangeLog for 2.8.1 compared to 2.8 *****