improve erp5_calendar
- fix set date to leave request error when leave request period has no date set yet
TypeError: '<' not supported between instances of 'NoneType' and 'NoneType'- Do not duplicate
leave_request_interaction_workflowinerp5_payroll_l10n_fr
erp5_payroll_l10n_fr depends already of erp5_calendar, let's move the extra interaction workflow from erp5_payroll_l10n_fr to erp5_calendar
/cc @tsoulard