Proper fix for #480916: only use cached node type when processing comments also for mail and pdf links

Fix #631760: add query string to user-specified print.css to force browser reload after cache is cleared

Fix #552646: don't add the page to be sent title field in the send-by-email form when the title is empty

Update changelog

Fix #566138: add setting to close the window when both the new window and send to printer are enabled

add new 'access send to friend' and 'access PDF version' permissions to any role which has 'access print'