* Added Project#activities to return all the Systemwide and Project specific
  activities, excluding Systemwide ones that are overridden.
* Added some tests for TimelogHelper.

  #4077

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2948 e93f8b46-1217-0410-a6f0-8f06a7374b81