Plasma/libplasma2/API Review/DataEngine

Status	Action	Method
TO DO	Remove	explicit DataEngine(QObject *parent , KService::Ptr service);	<{{{3}}}>
TO DO	Add	explicit DataEngine(QObject *parent, const KPluginInfo &info);	<{{{3}}}>
TO DO	Remove	DataEngine(QObject *parent, const QVariantList &args);	<{{{3}}}>
DONE	Keep	~DataEngine();
TO DO	Remove?	virtual void init(); can be removed is there will be only one constructor	<{{{3}}}>
DONE	Keep	virtual QStringList sources() const;
DONE	Keep	virtual Service *serviceForSource(const QString &source);
TO DO	Add	KPluginInfo pluginInfo() const;	<{{{3}}}>
TO DO	Remove	QString name() const;	<{{{3}}}>
TO DO	Remove	QString icon() const;	<{{{3}}}>
TO DO	Remove	QString pluginName() const;	<{{{3}}}>
DONE	Keep	void connectSource(const QString &source, QObject *visualization, uint pollingInterval, Plasma::IntervalAlignment intervalAlignment ) const;