Add pre-migration script for account module.
Update pre-migration.py

Remove print.
Update pre-migration.py

Add decorator
bank.statement.line does not support single value for id when writing its last_message_post
Full migration of account module
Remove a noisy space that disturb pep8
Finally do nothing for account_id inbank.statement.line
Merge pull request #74 from arthru/account

[8.0] 'account' migration.