Moved #link_to_version to ApplicationHelper (#17431).

git-svn-id: http://svn.redmine.org/redmine/trunk@13322 e93f8b46-1217-0410-a6f0-8f06a7374b81
Class mismatch when reloading in development mode (#17431).

git-svn-id: http://svn.redmine.org/redmine/trunk@13323 e93f8b46-1217-0410-a6f0-8f06a7374b81