attach(otherAnElement, reFormat = true) { //FIXME test this
        this._addToLocalList(otherAnElement.node()); //FIXME Should we make sure the element is not already in the list?
        if (reFormat) {
            otherAnElement.update(this.settings);
        }

        return this;
    }
Attach the given AutoNumeric element to the shared local 'init' list.
When doing that, by default the DOM content is left untouched.
The user can force a reformat with the new shared list options by passing a second argument to `true`.

@param {AutoNumeric} otherAnElement
@param {boolean} reFormat
@returns {AutoNumeric}