Use property to initialize (prevent null reference)

Added sup info pdf print to supinfo print enum
Use sup info pdf print from enum
fixed typo and use sup info pdf print from enum
B2017-136: Support section titles in proc step sections that have SAMG facing page supplemental info

PROMS/VEPROMS.CSLA.Library/Extension/ItemExt.cs

@@ -6936,7 +6936,11 @@ namespace VEPROMS.CSLA.Library
 		private List<int> _StepSectPageBreaksForSupInfo = null;
 		public List<int> StepSectPageBreaksForSupInfo
 		{
-			get { return _StepSectPageBreaksForSupInfo; }
+			get 
+			{
+				if (_StepSectPageBreaksForSupInfo == null) _StepSectPageBreaksForSupInfo = new List<int>();
+				return _StepSectPageBreaksForSupInfo; 
+			}
 			set { _StepSectPageBreaksForSupInfo = value; }
 		}
 		// Keeps track of step section itemids where page breaks occur