function _makeIndexRequestObject(requestIndex, index) {
        return {indexRequested: requestIndex, index: index};
    }
Make an index request object
@param {boolean} requestIndex - true to request an index, false if not
@param {number} index - the index to request
@return {indexRequested:boolean, index:number} an object that can be passed to
{@link Pane#addToViewList} to insert the item at a specific index
@see Pane#addToViewList