Added a 'delete' action, with the keyboard.

Added a delete action from the keyboard, there's also
a possibility to add the same action from the menu, but
I frankly don't like much the idea. so, to delete a handler
now, you need to select it ( ctrl + click ) then press
the delete button. Multiple delection is also possible.

Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>

qt-ui/diveplanner.h

@@ -78,6 +78,7 @@ protected:
 	qreal fromPercent(qreal percent, Qt::Orientation orientation);
 private slots:
 	void keyEscAction();
+	void keyDeleteAction();
 	void increaseTime();
 	void increaseDepth();
 	void okClicked();