Val now counts redirects from youtu.be to youtube.com as OK links.  These links will be reported on if the argument --show-yt-redirects is used.  Renamed --show-https-upgrade to --show-https-upgrades for consistency.  Also sorted the file and page suffix arrays and added some more items to them.  Now handling status codes 400, 418, 502 and 530.  Fixed incorrect nbsps in HTML report.  Val is no longer confused by URLs ending in '(' or ')', or which contain a '%' towards the end.