Added an option to be able to relate issues in different projects.

It can be set in Admin -> Settings (default: false).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@620 e93f8b46-1217-0410-a6f0-8f06a7374b81

config/settings.yml

@@ -72,3 +72,5 @@ autologin:
 date_format:
   format: int
   default: 0
+cross_project_issue_relations:
+  default: 0