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/_attributes.rhtml

@@ -19,7 +19,7 @@
                      :tabindex => 199) if authorize_for('projects', 'add_issue_category') %></p>
 <% end %>
 <% unless @issue.assignable_versions.empty? %>
-<p><%= f.select :fixed_version_id, (@issue.assignable_versions.collect {|v| [v.name, v.id]}), :include_blank => true %></p>
+<p><%= f.select :fixed_version_id, version_options_for_select(@issue.assignable_versions, @issue.fixed_version), :include_blank => true %></p>
 <% end %>
 </div>
 

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>

app/views/issues/context_menu.rhtml

@@ -38,12 +38,12 @@
 		<% end -%>
 		</ul>
 	</li>
-	<% unless @project.nil? || @project.versions.open.empty? -%>
+	<% unless @project.nil? || @project.shared_versions.open.empty? -%>
 	<li class="folder">			
 		<a href="#" class="submenu"><%= l(:field_fixed_version) %></a>
 		<ul>
-		<% @project.versions.open.sort.each do |v| -%>
-		    <li><%= context_menu_link v.name, {:controller => 'issues', :action => 'bulk_edit', :ids => @issues.collect(&:id), 'fixed_version_id' => v, :back_to => @back}, :method => :post,
+		<% @project.shared_versions.open.sort.each do |v| -%>
+		    <li><%= context_menu_link format_version_name(v), {:controller => 'issues', :action => 'bulk_edit', :ids => @issues.collect(&:id), 'fixed_version_id' => v, :back_to => @back}, :method => :post,
 		                              :selected => (@issue && v == @issue.fixed_version), :disabled => !@can[:update] %></li>
 		<% end -%>
 		    <li><%= context_menu_link l(:label_none), {:controller => 'issues', :action => 'bulk_edit', :ids => @issues.collect(&:id), 'fixed_version_id' => 'none', :back_to => @back}, :method => :post,