- Remove demo/icons/Logos.qrc, replaced by demo/resources/CGAL.qrc, that

also contains :/cgal/help/about_CGAL.html
- Add include/CGAL/Qt/debug.h and src/CGALQt/debug.cpp, that will contain
  debug tools/functions. For the moment, they just define:
      void traverse_resources(const QString& name);
  that must be used like that:
      CGAL::Qt:traverse_resources(":/cgal"); // view CGAL resources
  or
      CGAL::Qt:traverse_resources(":"); // view all resources
  and displays the resources tree on std::cerr.

GraphicsView/src/CGALQt4/debug.cpp

@@ -0,0 +1,32 @@
+#include <CGAL/Qt/debug.h>
+#include <QDir>
+
+#include <iostream>
+
+namespace CGAL {
+namespace Qt {
+
+
+void traverse_resources(const QString& name, const QString& dirname, int indent)
+{
+  std::cerr << qPrintable(QString(indent, ' '))
+            << qPrintable(name);
+  QString fullname = 
+    dirname.isEmpty() ?
+    name :
+    dirname + "/" + name;
+  QDir dir(fullname);
+  if(dir.exists()) {
+    std::cerr << "/\n";
+    Q_FOREACH(QString path, dir.entryList())
+    {
+      traverse_resources(path, fullname, indent + 2);
+    }
+  }
+  else {
+    std::cerr << "\n";
+  }
+}
+
+} // namesapce Qt
+} // namespace CGAL