QT4 compatibility.

runtime/Server.cpp

@@ -15,6 +15,8 @@
 #include <Python.h>
 
 // QT headers
+#include <QDebug>
+#include <QDir>
 #include <QMessageBox>
 
 // App headers

runtime/pgAdmin4.cpp

@@ -21,6 +21,7 @@
 #include <QtWidgets>
 #else
 #include <QApplication>
+#include <QDebug>
 #endif
 
 // App headers

runtime/pgAdmin4.h

@@ -12,6 +12,10 @@
 #ifndef PGADMIN4_H
 #define PGADMIN4_H
 
+// Include the Python header here as it needs to appear before any QT 
+// headers anywhere in the app.
+#include <Python.h>
+
 // QT headers
 #include <QtGlobal>