CenterLine          <Ctrl OT>
    -------------------------------------------------------------------------

    Centers the current cursor line based on column 1 and the right
    margin.  Use the SetRmargin <Ctrl OR> command to change the right
    margin.

    With the cursor inside of a line block, you can execute this command
    to center several lines at once.  With the cursor inside of a column
    block, you can center lines based on the left and right block
    boundaries.

    This command was added in QEdit v2.1