Business Layer; Checks to invalid Permission Keys for Administrators will now return False

Previously, if a User was signed in as an Administrator, all calls to finBL.CurrentUser.Permissions.Allow() would return True.

This made it very hard to detect when an invalid Permission Key was used when signed in as an Administrator.

This functionality has been changed so, providing an invalid Permission Key is not specified, the function will still return True for Administrators. However, if the Permission Key is invalid, it will now return False.