When rev date in proc config file is not a date, use change bar date

Changed casting iteminfo to procedure info to just using procedureinfo object to get pdfnumber for printing pdf

PROMS/Volian.Controls.Library/DisplayHistory.cs

@@ -158,7 +158,7 @@ namespace Volian.Controls.Library
 						else
 						{
 							DateTime revDate;
-							if (!DateTime.TryParse(cfg.Print_RevDate, out revDate)) revDate = DateTime.Now;
+							if (!DateTime.TryParse(cfg.Print_RevDate, out revDate)) revDate = MyProcedureInfo.ChangeBarDate;	// DateTime.Now;
 							SetRevDate(revDate);
 							//SetRevDate(DateTime.Parse(cfg.Print_RevDate));
 						}