Open Commerce Code

fix docstring

fix a mistake in getParent method

Implementing getParent Method

Adding a new test for add parent

Fix doc string

First step of UID management of object

Fix doc string

- Now commit method keyword is call transactional
- Correcting some doc string

Changing Database transactionnal structure :
- private method does no longer manage transaction
- now public method rollback transaction on exception

Replace %% search char to %.