fix issue #337
Previous fix for issue #321 (closed) (MR !557 (merged)) turned out to cause problems in RC (see issue #337 (closed)). Different fix was applied. Now the vop is not skipped during generation (related notifications reach RC as they should), but account history ignores that vop. Similar filter should be applied in sql serializer in HAF (with use on new is_effective_virtual_operation()
routine).