Fill ws_info structure and use it when entering weight systems

The code to initialize the weight systems from the last datafile loaded
had not been brought over from the Gtk version.

We now correctly update the data structure when loading file (but not yet
when editing values).

Most likely the same needs to be done for the tanks as well.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/models.h

@@ -59,6 +59,7 @@ public:
 	const QString& biggerString() const;
 	void clear();
 	void update();
+	void updateInfo();
 private:
 	int rows;
 	QString biggerEntry;