Add the ability to query based on GNATS "Release:". There's a new
pull-down box that defaults to "All", but has options for
"Pre-5.x", "4.x", "5.x", "3.x" and "2.x".

Give query-pr.cgi the full PR path. This will allow a future
query-pr.cgi to skip looking through the whole GNATS index to
display a PR.