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Added tests for newUid, __init__, save and modify_rank

Written test environment init
Written test for newUid and __init__

Pass the value of ranked_in instaed of the column name.

same as precedent

test si new_rank - 1 existe pour signe '='

En cas de signe égale prend désormais en charge une valeur de new_rank superieur ou inferieur a la valeur actuelle.

En plus de modifié la valeur en base, modifie la valeur d'instance.

Prise en compte du nom de la collonne indiqué par ranked_in

Fonction new_rank dans component. Permet la modification d'un rank tout en gardant la collection de component valide.

Ajout de local.py (sans majuscule)

The dates are set in EmComponent::create() for date_create and in EmComponent::save() for date_update
The values are sets to datetime.datetime.utcnow() so we now that EVERY date in the db are in UTC, no matter django, database or even server configurations.
We will have to take care to convert dates from database to django timezone in dates fieldtypes.

The dates are set in EmComponent::create() for date_create and in EmComponent::save() for date_update
The values are sets to datetime.datetime.utcnow() so we now that EVERY date in the db are in UTC, no matter django, database or even server configurations.
We will have to take care to convert dates from database to django timezone in dates fieldtypes.

Conflicts:
	EditorialModel/fieldtypes.py

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)