1/ Add Belgian benefit and leave types
=============================

2/ [IMP] hr_payroll: display worked days amount on payslip
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Purpose
-----------

Currently, the number of days and hours for each `worked_days_line_ids` are
displayed on the payslip report. However the corresponding amount is not.

Specification
-----------------

For each `worked_days_line_ids` of a payslip, display the corresponding
amount on the report.
Amounts should be computed as follows:
Worked days lines of unpaid benefit type: 0
For other worked days lines:

1. Compute what the employee should **not** earn for the unpaid days
`unpaid amount = (average salary per day)*(number of unpaid days)`
The average salary per day is computed on a 3 month basis (there are always the
same number of days in 3 months=13 weeks).
=> `unpaid amount =  wage*3/13/5 (5 days/week)`

2. Compute what the basic salary becomes:
`basic = wage - unpaid amount`

3. Distribute the basic salary among paid worked days types.
`amount of the line = basic * (number of days of the line)/(total number of paid days)`

3/ [IMP] l10n_be_hr_payroll: 13th month salary structure
=============================================

Purpose
---------   
Currently, 13th month computation doesn't take into account several things:
    
- An employee should not receive a 13th month if he arrive after the 1st July
    
- The amount should be proportional to the employee seniority if he arrived between the 1st January and 1st July.
    
- Several benefit type should be deducted from the 13th month:
      - Unpaid
      - Time Credit
      - Parental Time Off
      - Unpredictable Reason
      - Long Term Sick
      - Long Term Sick > 12 months
      - Part Time Sick
      - Notice
    
Specification
--------
Take into account points above


Task 1923143

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