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

app/views/issues/bulk_edit.rhtml

@@ -31,7 +31,7 @@
 <label><%= l(:field_fixed_version) %>: 
 <%= select_tag('fixed_version_id', content_tag('option', l(:label_no_change_option), :value => '') +
                                    content_tag('option', l(:label_none), :value => 'none') +
-                                   options_from_collection_for_select(@project.versions.open.sort, :id, :name)) %></label>
+                                   version_options_for_select(@project.shared_versions.open)) %></label>
 </p>
 
 <p>