On the 'auth-notification' branch:  Remove a notification action and
the handling thereof.  The system isn't quite behaving as I'd expected.

* subversion/libsvn_subr/auth.c
  (svn_auth_save_credentials): Don't use svn_auth_notify_creds_validated.

* subversion/include/svn_auth.h
  (svn_auth_notify_creds_validated): Remove enum value.  While in the
    area, add some docs.

* subversion/svn/svn.c
  (auth_notify): Drop handling of svn_auth_notify_creds_validated.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/auth-notification@1484938 13f79535-47bb-0310-9956-ffa450edef68