Add the ability to modify the cylinder use in the UI

Thanks to Tomaz for writing a first draft of the delegate.

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

qt-ui/models.h

@@ -107,6 +107,7 @@ public:
 		O2,
 		HE,
 		DEPTH,
+		USE,
 		COLUMNS
 	};