[MERGE] sale_timesheet: improvements for service company

Impacted modules: hr_timesheet, sale_timesheet, sale
and project_timesheet_holidays

The main change is the product configuration: a service
can create a task or a project, even if the update of
delivered quantities is manual.

Some code cleaning were done to ease comprehension and
maintenability.

This merge also bring usability changes and fine tuning
to manage your service like a pro.

For details, please have a look at sub commits.

Thanks for Thibault for the review and Benjamin (and Indian
Testing Team) for testing this. And Martin Trigaux that
did nothing, since he was on a stupid mountain ...

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