Cleanup some form related code
[mms] Add Horde_Core_Script_Package_Sortable.
Don't need edit permissions to apply filters
[mms] Sorting of rules now done via drag/drop javascript.
Simplify
Tweaks to ingo rule page

Still needs an overhaul, but at least this makes it a bit easier to read
things for now.
[mms] Add null VFS driver.
Support 'none' as an alias for the Null VFS driver
Horde_Vfs is a dependency of Turba
Turba now uses Horde_Vfs_Null internally if not VFS driver is configured

Explicitly check for UI elements. But no longer a need to check in data
elements - it will just return nothing now instead of throwing an error
(only way to get to these areas would be by direct access without using the
UI).