Attempts to create a home root folder (e.g. "users/joe") for the current user. This results in an error if the user already has a home root folder or the requested ID is unavailable.
UsageReturns, callback)
requestedIdStringThe requested ID of the home folder

(e.g. "users/joe").

callbackFunction, optionalAn optional callback. If not supplied, the call is made synchronously.