[pLog-general] user authenication by filter

[su baochen]

hi,

Below is the way I have done to authenticate user by filter. But I have
not fully tested it,sorry.

1 create loginauthfilter.class.php in class/security directory, see
attachment.
2 path class/action/admin/adminaction.class.php, see attachemnt for
patch
3 create standarderrorrenderer.class.php in
class/template/errorrenderers, see attachment. I create this file
inspired by oscar's standardvalidationrenderer.class.php. 

Again, I have not tested the code under php4, sorry.
-- 
su baochen <subaochen at 126.com>
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