erp5_simulation: split and move solver now working when there is several lines in delivery

The code was assuming that we could have only one quantity divergency per
delivery. So improve to support multiple divergencies.
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Status Job ID Name Coverage
  External
failed ERP5.CodingStyleTest-Master

01:09:42

passed ERP5.PerformanceTest-Master

00:26:17

failed ERP5.UnitTest-Master

02:07:56

failed ERP5.UnitTest-Master.Medusa

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passed SlapOS.Eggs.UnitTest-Master.Python2

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passed SlapOS.Eggs.UnitTest-Master.Python3

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