When we add Custom Column, allow us to choose its position

When we add a new column in the Query Editor, it always places the column at the end. This makes it difficult to visualy relate the new column with the other columns that were used in the calculation, and make if difficult to debug our custom column code. The workaround to use ordering after we add the column, is not user friendly if we have dozens of columns.

It would be helpful, if we can choose the location of the column from the UI (with a default), and that you add a fourth optional parameter in Table.AddColumn for the column that the new column will be added after.

Note: If you don't improve Table.AddColumn, and instead implement it using Table.OrderColumns, please don't refer to all the column names in the formula (It fails too often in refresh when column names are missing).