Stores preferences for displaying admin grids against admin users
- Ensures that grid preferences are not lost between admin sessions
- Fixes Magento bug that stops users preferences for the display of system config tabs from being correctly saved
- Works across all grids to save subset of the standard parameters of: ** Sort Column ** Sort Direction ** Search Filters ** Rows per Page ** Current Page Number
- Admin interface to select which of these settings get saved
- Uses controller_action_predispatch_adminhtml and controller_action_predispatch_adminhtml to load grid preferences from admin user to session and save them back again