Encode search string for use in anchor tags.

Sorting, and viewing more results resets the search
if you search for '#' in 1.5.3. This should fix that bug.
Signed-off-by: Loui Chang <louipc.ist@gmail.com>
Signed-off-by: Callan Barrett <wizzomafizzo@gmail.com>

web/template/pkg_search_results.php

+<?php
+# Encode search string
+$K = urlencode($K);
+?>
 <form action='packages.php?<?php print $_SERVER['QUERY_STRING'] ?>' method='post'>
 <center>