Removed unnecessary '+' character URL decoding from search query

Manually replacing '+' character or "%20" by a space character in the
search query parameter was necessary in YaCy a long time ago to properly
decode application/x-www-form-urlencoded format (commit
9842fab6e4 in 2010).
Since the introduction of Jetty as the embedded HTTP server (commit
4b77733e59 in 2013), this is no more
necessary as Jetty internals already do this for us in
org.eclipse.jetty.util.UrlEncoded.decodeUtf8To().

So we can remove now this duplicated decoding as it prevents a proper
use of the '+' character in search requests, as reported in issue #216.

htroot/suggest.java

@@ -62,7 +62,7 @@ public class suggest {
         
         // get query
         final String originalquerystring = (post == null) ? "" : post.get("query", post.get("q", ""));
-        final String querystring =  originalquerystring.replace('+', ' ').replaceAll("%20", " ");
+        final String querystring =  originalquerystring.trim();
         final int timeout = (post == null) ? 300 : post.getInt("timeout", 300);
         final int count = (post == null) ? 10 : Math.min(30, post.getInt("count", 20));
 

htroot/yacysearch.java

@@ -134,7 +134,7 @@ public class yacysearch {
         final boolean focus  = (post == null) ? true : post.get("focus", "1").equals("1");
         // get query
         final String originalquerystring = (post == null) ? "" : post.get("query", post.get("search", "")).trim();
-        String querystring = originalquerystring.replace('+', ' ').trim();
+        String querystring = originalquerystring;
         CacheStrategy snippetFetchStrategy = (post == null) ? null : CacheStrategy.parse(post.get("verify", sb.getConfig("search.verify", "")));
         
         final servletProperties prop = new servletProperties();