BGE: Change Id dialogue at program startup

BGE: Support for Change Id in step config
BGE: change property name from MultipleChangeIds to ChangeIds

PROMS/VEPROMS User Interface/dlgChgId.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Text;
+using System.Windows.Forms;
+using Volian.Controls.Library;
+
+namespace VEPROMS
+{
+	public partial class dlgChgId : Form
+	{
+		DisplayTabControl TabControl;
+		public dlgChgId(DisplayTabControl tc)
+		{
+			InitializeComponent();
+			TabControl = tc;
+			tbChgId.Focus();
+		}
+
+		private void btnOk_Click(object sender, EventArgs e)
+		{
+			TabControl.ChgId = tbChgId.Text;
+		}
+
+		private void btnCancel_Click(object sender, EventArgs e)
+		{
+			TabControl.ChgId = null;
+		}
+	}
+}