Slight change to the project combo for adding membership on user administration screen.

All projects are listed, and the ones that the user belongs to are disabled.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/work@2301 e93f8b46-1217-0410-a6f0-8f06a7374b81

nested_projects/app/views/users/_memberships.rhtml

@@ -31,7 +31,7 @@
 <p>
 <label><%=l(:label_project_new)%></label><br/>
 <% form_tag({ :action => 'edit_membership', :id => @user }) do %>
-<%= select_tag 'membership[project_id]', projects_options_for_select(@projects) %>
+<%= select_tag 'membership[project_id]', options_for_membership_project_select(@user, @projects) %>
 <%= l(:label_role) %>:
 <%= select_tag 'membership[role_id]', options_from_collection_for_select(@roles, "id", "name") %>
 <%= submit_tag l(:button_add) %>