Qt: small header changes / fixes

- ensure header inclusion guard is named after the header file
- add missing comments at the end of some inclusion guards
- add a small Qt5 compatibility fix in macdockiconhandler.h

src/qt/addressbookpage.h

@@ -56,4 +56,4 @@ private slots:
     void selectionChanged();
 };
 
-#endif // ADDRESSBOOKDIALOG_H
+#endif // ADDRESSBOOKPAGE_H

src/qt/bitcoinamountfield.h

@@ -1,5 +1,5 @@
-#ifndef BITCOINFIELD_H
-#define BITCOINFIELD_H
+#ifndef BITCOINAMOUNTFIELD_H
+#define BITCOINAMOUNTFIELD_H
 
 #include <QWidget>
 
@@ -57,4 +57,4 @@ private slots:
 };
 
 
-#endif // BITCOINFIELD_H
+#endif // BITCOINAMOUNTFIELD_H

src/qt/bitcoingui.h

@@ -157,4 +157,4 @@ private slots:
     void unlockWallet();
 };
 
-#endif
+#endif // BITCOINGUI_H

src/qt/macdockiconhandler.h

@@ -1,7 +1,7 @@
 #ifndef MACDOCKICONHANDLER_H
 #define MACDOCKICONHANDLER_H
 
-#include <QtCore/QObject>
+#include <QObject>
 
 class QMenu;
 class QIcon;

src/qt/transactiontablemodel.h

@@ -80,5 +80,4 @@ public slots:
     friend class TransactionTablePriv;
 };
 
-#endif
-
+#endif // TRANSACTIONTABLEMODEL_H