hexadecimal digits] We no longer escape an % which is not followed by
two hex characters, at least not until forced. This is more compatible
with current usage in other browsers. r=dougt@netscape.com,
sr=darin@netscape.com
git-svn-id: svn://10.0.0.236/trunk@107259 18797224-902f-48f8-a5cc-f745e15eee43