Enhanced tab: if no available docversions to link to from a source, hide ‘new’ button

Caching fix
B2016-132 fix: don’t allow double click to insert RO when on enhanced step

PROMS/Volian.Controls.Library/DisplayRO.cs

@@ -916,6 +916,8 @@ namespace Volian.Controls.Library
 
 		private void tvROFST_DoubleClick(object sender, EventArgs e)
 		{
+			// B2016-132: don't process a double click on an RO if on an enhanced step:
+			if (MyRTB != null && MyRTB.MyItemInfo != null && MyRTB.MyItemInfo.IsEnhancedStep) return;	
 			//if (tvROFST.SelectedNode == null) return;
 			//RunRoEditor();
 			SaveRO();