Added support for showing the Stars on the DiveTable

For the stars on the dive table I had to rework a bit my
StarRating widget, because it used a pixmap for each widget
that were created. Not it uses only 2 pixmaps: the active
and inactive ones.

A new file was created named modeldelegates(h, cpp) that
should hold all delegates of the models. For the GTK / C
folks, a 'Delegate' ia s way to bypass the default behavior
of the view that's displaying the data.

I also added the code to display the stars if no delegate
is set ( good for debugging. )

Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>

qt-ui/modeldelegates.h

@@ -0,0 +1,12 @@
+#ifndef MODELDELEGATES_H
+#define MODELDELEGATES_H
+
+#include <QAbstractItemDelegate>
+
+class StarWidgetsDelegate : public QAbstractItemDelegate {
+	Q_OBJECT
+public:
+    virtual void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const;
+    virtual QSize sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const;
+};
+#endif