/**
* add an Edit column (nlobjColumn) to the left of the column specified.
*
* @param {nlobjColumn} column
* @param {boolean} showView should Edit|View instead of Edit link
* @param {string} [showHref] column that evaluates to T or F that determines whether to disable the edit|view link per-row.
* @return {nlobjColumn}
*
* @since 2008.2
*/