New - Dev|pkg|test|doc
* Introduce QueryBase class. [Christophe de Carvalho]
This class is the base for any other class that uses SQL query.
It has 2 child classes, Transformation and View.
* Add concept of View object. [Christophe de Carvalho]
You can now define views.
The work mostly the same way Transformation do, but without all the
tables related configurations.