Due to the new EU Copyright Directive I am removing direkt links in posts to anything which may fall under the new copyright laws. I regret that I can no longer give you the service of embedded material and direkt links other than to a very limited extent. For learning purposes this is less than ideal.
This is a time consuming work. I am working through posts and material in reverse chronological order. As I know this site is actively used I am trying to adapt material rather than just removing it. Instead of including hyperlinks I will rephrase the text to indicate where resources can be found.