[IMP] project: a project is not an analytic account anymore !

This commit removes the inheritS between account.analytic.account and
project.project. This means :
- When a project is created, an analytic account is not necessarily
genareted
- project has now its own name, company_id and partner_id fields
- an analytic account can be linked to several project
- project module does not depend anymore of analytic, but hr_timesheet
does.

This change implied
- an analytic account is required on project to timesheet on
its tasks. So, when checking 'allow_timsheets', if an AA is not
provided at project creation, an AA will be generated.
- to timesheet on project, an active AA is required. We don't want
timesheeting on project linked to unused AA to avoid bad analytic
entries.

This prepare the fact a sale order can create multiple project, sharing
the same analytic account (the one from the SO).

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