1/ An empty notebook was created in analytic and filled in account_budget
That way, we had a horizontal line while the module wasn't installed yet
2/ The fields use_task and use_issue displayed on the account.analytic.account
are just redundant information. The probable use case is to go on the project
select the issues management on it, and it will be activated on the related
analytic account. I don't think that anybody will come on the analytic account
to activate the issues. So we hide them in group_no_one
3/ On the analytic account form view, display the title label only in edit mode