Fix problem with utf-8 charactes in playlist names

If a playlist had utf-8 characters in it's name, promoe couldn't switch
to it.
Also move another function from XMMSHandler to class in lib

lib/xcollection.cpp

@@ -185,7 +185,7 @@ bool
 XCollection::setActivePlaylist (QString name) {
 	if (!m_client->isConnected ()) return false;
 
-	m_client->playlist ()->load (name.toStdString ());
+	m_client->playlist ()->load (XClient::qToStd (name));
 
 	return true;
 }

lib/xplayback.cpp

@@ -96,6 +96,15 @@ XPlayback::next ()
 	m_client->playback ()->tickle ();
 }
 
+void
+XPlayback::setPos (int pos)
+{
+	if (!m_client->isConnected ()) return;
+
+	m_client->playlist ()->setNext (pos) ();
+	m_client->playback ()->tickle () ();
+}
+
 /*
  * Seeking
  */

lib/xplayback.h

@@ -41,6 +41,7 @@ class XPlayback : public QObject {
 		void stop ();
 		void prev ();
 		void next ();
+		void setPos (int pos);
 
 		void seekMs (uint milliseconds);
 		void seekMsRel (int milliseconds);