[FIX] web_gantt: duration in business days if delay not set

delay already being the hours amount in business hours

opw-620189
[FIX] crm_partner_assign: more precise geolocation

Google api geolocation service returns a precise latitude and longitude, greater or equal than 5 digits
The precision is important as storing 2 digits instead of 5 can lead to an inaccuracy of allmost half a mile.
[FIX] account: prevent selecting company's contacts for manual account.move.line

Only the commercial partner (parent company) should be set in partner field of
an account.move.line.
Fixes #4261, opw 618763
[FIX]stock: return of 'To Be Invoiced' picking should also be invoiced

When creating a return picking, the default invoice state is 'To Be Invoiced' if
returned picking was invoiced. However if the invoice of the picking has not
been generated yet (state '2binvoiced'), the return should also be invoiced.
Fixes #4002
[FIX] account: aged partner balance, advance partial payment

Partners totals were not correct if the partner paid partially an invoice in advance
For an invoice of 20.000 in the future, with a payment made in advance of 5000
The column not due must contains 20.000, as the amount is not yet due
One of the column 1-30, 30-60, ... (accordingly on when the payment was made). must contains -5000
The total should be 15.000
[FIX] account_check_writing: correct domains on allow_check

Fixes #4269
[FIX] project: don't use planned_hours in project gantt

The gantt view does not have enough data to properly display a project's length
based on only the planned hours.
It also makes it impossible to change the project's length using drag & drop.
It's safer to simply display the start and end dates recorded in the project
Fixes #2632
[REF] Packaging: Backport of v8 packaging

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[FIX] Packaging: backport of 134716308266ff
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