Conflicts:
	EditorialModel/classes.py

Added a classmethod EmComponent::newUid() that determines the caller's class and return a newly registrated UID

SQL calls are in _populateDb , _saveDb and _createDb methods (exception for component::delete() )

Put every uid columns and associated FK in INTEGER instead of VARCHAR(50)

Adding a column is implemented for mysql, postgresql and sqlite.
Droping and altering a column is only implemented for mysql and postgresql for the moment.

Quick&dirty tests has been done  for sqlite and mysql only.

To-Do: tester

To-do: prendre en charge le cas de execute ou une query a des parametre binder et une liste de dictionnaire est envoyé en param

Implementation d'alias au ordre sqlalchemy: select, select_from, where, update, execute
To-Do: implemente insert et delete, tester.

Now SQLSetup in able (via initDb) to initialize the database.
WARNING : initDb start by droping all tables in database before creating the new ones