[6.0.1][project] do not hardcode that project durations are in hours

[Raphaël Valyi - http://www.akretion.com]

OpenERP has a great feature: in the company you can choose if you want to use, days, hours or weeks as you project time unit. Cool!

Now if you look in the project form, you'll see that no matter what, the project planned_hours and effective_hours are expressed in hours.

In my opinion, at least at the widget level this should match your time unit company selection.
The bug comes from:

                                <field name="planned_hours" widget="float_time"/>
                                <field name="effective_hours" widget="float_time"/>

In the project.project.form view. I don't really know what you can do. May be switch the widget in in a fields_view_get override according to the company of the current user_id (because with Open Object framework, you could not have different views for the same menu entry even if project belong to companies with different time unit settings).