Added Checking of filetypes from the xml. Added a static function fileTypeFromData to the DataFile class. This opens the given file and checks the xml for its file type, as oposed to relying on the file extension

include/DataFile.h

@@ -56,6 +56,11 @@ public:
 	DataFile( const QByteArray& data );
 	DataFile( Type type );
 
+	/// \brief fileTypeFromData
+	/// Reads the given file and checks the xml for the type
+	/// returns UnknownType if the file is not reconised
+	static DataFile::Type fileTypeFromData( const QString fileName);
+
 	virtual ~DataFile();
 
 	QString nameWithExtension( const QString& fn ) const;