finish review of polyhedron demo

Polyhedron/demo/Polyhedron/Scene.cpp

@@ -15,7 +15,6 @@
 #include <QObject>
 #include <QMetaObject>
 #include <QString>
-#include <QOpenGLWidget>
 #include <QEvent>
 #include <QMouseEvent>
 #include <QPainter>

Polyhedron/demo/Polyhedron/Show_point_dialog.cpp

@@ -53,7 +53,7 @@ void Show_point_dialog::interprete_string(const QString& string)
     + "$";
 
   QRegularExpression re(full_re);
-  QRegularExpressionMatch match = re.match(string); // AF @todo  QRegExp had exactMatch()
+  QRegularExpressionMatch match = re.match(string);
   if(match.hasMatch()) {
     // const double x = re.cap(1).toDouble();
     // const double y = re.cap(2).toDouble();