New project wizard: Make it clearer that it is added as a subproject

Task-number: QTCREATORBUG-5936
Change-Id: If06f69184f2e2754c630c7b015c78b40a9278dc1
Reviewed-on: http://codereview.qt.nokia.com/3806
Reviewed-by: Jarek Kobus <jaroslaw.kobus@nokia.com>

src/plugins/projectexplorer/projectwizardpage.h

@@ -68,6 +68,7 @@ public:
     // Returns the common path
     void setFilesDisplay(const QString &commonPath, const QStringList &files);
 
+    void setAddingSubProject(bool addingSubProject);
 protected:
     virtual void changeEvent(QEvent *e);