Bug #0000009: Admin: Duplicate Link Checker.

1. Allows to use base64_encode function result as ID in grids.
2. Deprecated "adm_SaveReturnScript" tag removed.
3. When grid with special was used and event raised from grid (like OnPreCreate or OnNew) performed redirect, when first selected item ID was not passed in redirect link.
4. Private method "kCatDBEventHandler::_getMassPermissionEvents" added. Method allows category item event handlers to add own events to permission checking.

MINL-1