PATCH: consistancy in converting urls in posts to links (cleanhtml.pl)
currently cleanhtml.pl will convert any url beginning with http to a url. this, however, does not happen if any of the letters in http are capitalized (see examples). this is a fairly trivial issue, since most users will post urls in lower case. but occasionally they don't, and we should be consistant if we are already converting urls to links. so i've changed the reg. exp. that does this to ignore case. it has been tested and seems to work.