improve URL recognition

[[http://wagn.org/new?card[type]=Image|new image]]

http://ourpla.net/thisis[atest]

http://wagn.org/search/)

http://wagn.org/search/%

http://wagn.org/search/even%inthemiddle

http://wagn.org/search/^

http://wagn.org/search/even^inthemiddle

http://wagn.org/search/

http://wagn.org/search/eveninthemiddle

http://wagn.org/search/|

http://wagn.org/search/even|inthemiddle

http://wagn.org/search/{

http://wagn.org/search/even{inthemiddle

http://wagn.org/search/}

http://wagn.org/search/even}inthemiddle

http://wagn.org/search/"

http://wagn.org/search/even"inthemiddle

http://wagn.org/search/`

http://wagn.org/search/even`inthemiddle

http://wagn.org/search/[

http://wagn.org/search/even[inthemiddle

http://wagn.org/search/]

http://wagn.org/search/even]inthemiddle

http://ourpla.net/cgi/pikie? (actual link includes ? even though it visually renders without it)