COPKGManager: add members to get package infos and optmize update check

Origin commit data
------------------
Commit: b3afd24260
Author: Thilo Graf <dbt@novatux.de>
Date: 2014-12-19 (Fri, 19 Dec 2014)

data/locale/deutsch.locale

@@ -1867,6 +1867,7 @@ opkg.failure.upgrade Upgrade fehlgeschlagen
 opkg.install.local.package Installiere lokales Paket
 opkg.messagebox.reinstall %s erneut installieren?
 opkg.messagebox.remove %s entfernen?
+opkg.messagebox.updates.available Aktualisierungen verfügbar!
 opkg.success.install Installation erfolgreich, Neustart von Neutrino kann erforderlich sein.
 opkg.title Paketverwaltung
 opkg.upgrade Installierte Pakete aktualisieren

data/locale/english.locale

@@ -1867,6 +1867,7 @@ opkg.failure.upgrade Upgrade failed
 opkg.install.local.package Install local package
 opkg.messagebox.reinstall Re-install %s?
 opkg.messagebox.remove Remove %s?
+opkg.messagebox.updates.available Updates available!
 opkg.success.install Install successful, restart of Neutrino might be required.
 opkg.title Package Management
 opkg.upgrade Upgrade installed packages

data/locale/nederlands.locale

@@ -1758,6 +1758,7 @@ opkg.failure.upgrade Upgrade mislukt
 opkg.install.local.package Installeer lokale pakket
 opkg.messagebox.reinstall Herinstalleer %s?
 opkg.messagebox.remove Wissen%s?
+opkg.messagebox.updates.available Updates beschikbare!
 opkg.success.install installatie succesvol, herstart van Neutrino mogelijk vereist.
 opkg.title Pakket management
 opkg.upgrade Upgrade geïnstalleerd pakketten

data/locale/slovak.locale

@@ -1848,6 +1848,7 @@ opkg.failure.upgrade Upgrade zlyhalo
 opkg.install.local.package Nainštalujte miestne balíček
 opkg.messagebox.reinstall Preinštalovať %s?
 opkg.messagebox.remove Odstrániť %s?
+opkg.messagebox.updates.available Aktualizácia k dispozícii!
 opkg.success.install Inštalácia v poriadku, reštart Neutrina bude žiadúci.
 opkg.title Správa balíčkov
 opkg.upgrade Aktualizovanie inštalovaných balíčkov