add SetPassword on account service
merge .config settings into in-memory settings so we can still do code based config
add NameId GUID to UserAccount; this is used for NameIdentifier claim
reset back to regular password hashing
check status from cancel registration
provide username changed APIs on notification services
enhance account verification key
add support for changing username
add ui to change username
is email is username, prevent changeusername API; check for existing email in change email