* serv_imap.c: fail with a "BAD" error response if the LOGIN command is

* serv_imap.c: fail with a "BAD" error response if the LOGIN command is
  called with the wrong number of parameters (otherwise it goes boom)
* user_ops.c: CtdlLoginExistingUser() was calling strproc() on the supplied
  name, which killed the ability to log in with your email address (because
  it stripped the @ symbol).  Changed it to striplt() instead.