delete-trailing-whitespace + some copyright update

ajax_replace_url becomes obsolete, req.build_ajax_replace_url should be used instead The idea is to generate the full URL on the server side and not on the client side (i.e in JS). This way, this gives a chance to the ajax link to work outside the application itself (typically mash-ups).

[calendar] ensure task.start / task.stop are available before calling todate()