updated links to my JOGL courses

Hello,
I have changed the links to my courses on JOGL in http://jogamp.org/wiki/index.php/Jogl_Tutorial.
The new links are:
http://www.manuel-carcenac.com/courses/index.html
http://www.manuel-carcenac.com/courses/Graphics_in_Java/index.htm
http://www.manuel-carcenac.com/courses/Advanced_Graphics_in_Java_and_JOGL/index.htm

Due to some technical issues, the old links were broken for some time. I am really sorry about it.

Hoping my courses can help.

Best Regards,
Manuel