Added the ability to copy a project in the Project Administration panel.
* Added Copy project button.
* Added Project#copy_from to duplicate a project to be modified and saved by the user
* Added a ProjectsController#copy based off the add method
** Used Project#copy_from to create a duplicate project in memory
* Implemented Project#copy to copy data for a project from another and save it.
** Members
** Project level queries
** Project custom fields
* Added a plugin hook for Project#copy.
#1125 #1556 #886 #309
git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2704
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