Added Property yVeryBottom

Changed the format of the Verical Ruler in the Debug PDF Layer to start at the top margin and extend to the bottom margin.
Partial fix of the logic to display an XY Plot.

PROMS/XYPlots/frmXYPlot.cs

@@ -21,6 +21,8 @@ namespace XYPlots
 		public frmXYPlot(string title,string xyPlot)
 		{
 			InitializeComponent();
+			int pstart = xyPlot.IndexOf("<<G"); //  find the starting Plot Command
+			xyPlot = xyPlot.Substring(pstart); // set val to the start of the plot commands
 			_XYPlot =xyPlot;
 			_Title = title;
 		}