'remaining_hours' is defined in project as a simple
float field, manually updateable, only displayed
when the group "Time Estimation on Task" is activated.
But for now, there is no setting to active this group.
Those are legacy useless stuff, so we can remove it.
The purpose is to make 'time estimation' feature only
available when timesheet is installed.
Thie commit also split the compute methods of
'remaining_hours' and 'progress' fields to make
'remaining_hours' updateable, though inverse method.
Without splitting the compute method, the calculation
of the progress was done correctly during onchange
but not when saving.
jem-odoo
d50a1e2622