[FIX] account: compute total invoice in batch

The computation of the total_invoiced field did not work in batch mode.
When displaying a company in a form view (field invoice_total comptued), the
children of this company are present in the cache and the value of the field
invoice_total will be prefetched for these children as well (at least in 9.0).
Most of the time this is redudant information and the same value is computed
for each child while most of the invoices are on the parent.

Batching the computation per partner allows to make one global query for all
partners.

Add test to make sure the total increase correctly after a test invoice
confirmation.

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