title: Gembox Spreadsheet add column without remove the other ones
body: <p>I'm coding in c# and using Gembox Spreadsheet to manipulate excel files.
  I'd like to know if it's possible to add a column(without remove the other ones) in a pre-existent xls file:</p>
  
  <pre><code>ExcelFile ef = ExcelFile.Load(masterFile);
  ExcelWorksheet ws = ef.Worksheets["Peer Review"];
  DataTable dataTable = new DataTable();
  dataTable.Columns.Add("Standard Deviation", typeof(double));
  ws.InsertDataTable(dataTable, new InsertDataTableOptions()
              {
                  ColumnHeaders = true,
                  StartRow = 0,
                  StartColumn = 15
              });
  ef.Save(masterFile);
  </code></pre>
  
  <p>In the way I mentioned I can insert a new column at position "15" but in the same way the 15th old column is removed. So I'd like to insert a column without removing the other ones.</p>