simplified amazon interwiki links. closes #1588

conf/interwiki.conf

@@ -26,9 +26,9 @@ wpmeta    https://meta.wikipedia.org/wiki/{NAME}
 doku      https://www.dokuwiki.org/
 rfc       https://tools.ietf.org/html/rfc
 man       http://man.cx/
-amazon    https://www.amazon.com/exec/obidos/ASIN/{URL}/splitbrain-20/
-amazon.de https://www.amazon.de/exec/obidos/ASIN/{URL}/splitbrain-21/
-amazon.uk https://www.amazon.co.uk/exec/obidos/ASIN/
+amazon    https://www.amazon.com/dp/{URL}?tag=splitbrain-20
+amazon.de https://www.amazon.de/dp/{URL}?tag=splitbrain-21
+amazon.uk https://www.amazon.co.uk/dp/{URL}
 paypal    https://www.paypal.com/cgi-bin/webscr?cmd=_xclick&business=
 phpfn     https://secure.php.net/{NAME}
 skype     skype:{NAME}