* Removed some cruft from the login code. Combined the

* Removed some cruft from the login code.  Combined the
  do_login() and session_startup() functions.  Moved more duplicated
  code into a single code path.
* Completed the OpenID signin process for existing users, and for new
  users who have made their preferred nickname available via Simple
  Registration Extension (assuming this nickname is available on the
  Citadel system).  Other sign in flows are forthcoming...