Version sharing (#465) + optional inclusion of subprojects in the roadmap view (#2666).

Each version of a project can be shared with:
* subprojects
* projects in the project hierarchy: ancestors + descendants (needs versions management permission on the root project)
* projects in the project tree: root project + all its descendants (same as above)
* all projects (can be set by admin users only)

Notes:
* when sharing a version of a private project with others projects, its name will be visible within the other projects
* a project with versions used by non descendant projects can not be archived

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3123 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine.rb

@@ -142,7 +142,7 @@ Redmine::MenuManager.map :project_menu do |menu|
   menu.push :overview, { :controller => 'projects', :action => 'show' }
   menu.push :activity, { :controller => 'projects', :action => 'activity' }
   menu.push :roadmap, { :controller => 'projects', :action => 'roadmap' }, 
-              :if => Proc.new { |p| p.versions.any? }
+              :if => Proc.new { |p| p.shared_versions.any? }
   menu.push :issues, { :controller => 'issues', :action => 'index' }, :param => :project_id, :caption => :label_issue_plural
   menu.push :new_issue, { :controller => 'issues', :action => 'new' }, :param => :project_id, :caption => :label_issue_new,
               :html => { :accesskey => Redmine::AccessKeys.key_for(:new_issue) }