Add depth colum to cylinder model

To make the planner work this adds a new column to the Cylinder widget
(depth - for the depth at which we want to change to a certain gas
during deco).

This also tries to hide that column in the equipment view and hide the
start/end pressure columns in the planner view. Oddly that fails :-(

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/tableview.h

@@ -14,7 +14,7 @@ class QAbstractItemModel;
 class QModelIndex;
 class QTableView;
 
-class TableView : public QWidget {
+class TableView : public QTableView {
 Q_OBJECT
 public:
 	TableView(QWidget *parent = 0);