Merge branch 'master' of tuleap.net:tuleap/tuleap/stable into stable

* 'master' of tuleap.net:tuleap/tuleap/stable: (118 commits)
  This is Tuleap 5.8.99.16
  Tuleap 5.8.99.15
  Fix defect #1886: allow to dump tracker structure (fix test on tracker userIsAdmin) Refactor tests to make them throw errors on notices
  ref fix
  fixing tests
  fixing bug of missing require_onces
  fixing test
  Restore feedback
  This is Tuleap 5.8.99.15
  merging master and fixing bugs
  Fix warnings with timezone
  Tuleap 5.8.99.13
  adding type declaration to exportToXml methods
  fixing bug on ugroup notifications
  Fix test (getFieldTo)
  Add help on parameteres
  The passed value should be the target value, not source
  the user parameter is an id
  Do not after() if not defined
  adding type declaration; removing ampersand
  ...
This is Tuleap 5.8.99.17