Horde_Auth rewrite.

Horde_Auth rewrite.

Store data in static class variable instead of globally
Add getLoginParams()
Move logout reason string and changepassword code to login page
Rework session storage of auth information.
All application-specific auth tasks should now be handled properly by
both Horde_Auth and Horde_Auth_Application
Horde_Registry::pushApp() should now do all necessary authentication and
permissions checking in a single call.