custom annotation for dao method which doesn't need HQL in the entity

[Enrico Giurin]

As lambico developer/user I would like to define a custom marker
annotation to add to all those DAO methods which do not need
corresponding HQL Named Query in the entity.
i.e. all the methods like findbyXAndY where x, y are simple attributes
of the entity itself.

This prevents confusion and misunderstanding for all the developers
who have no clue why some methods need and some others no to have
NamedQuery in the entity.