Added a new class to handle the DivePlanner dialog

Added a new class named DivePlanner that is a QDialog,
and renamed the old DivePlanner class to DivePlannerGraphics.

Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>
Added back the menu entry 'Dive Planner'

Added back the menu entry Dive Planner, and removed the
calee code from the Print action.

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