Visma Economic - support entry-level and posting-level data#1713

I.e. the accountingEntries / vouchers / journals endpoints from the e-conomic REST API — including the departmentalDistribution field per posting

accounting_entries__entrynumber

accounting_entries__accountingyear

accounting_entries__date

accounting_entries__accountnumber

accounting_entries__account

accounting_entries__entrytype

accounting_entries__text

accounting_entries__amount

accounting_entries__amountinbasecurrency

accounting_entries__currency

accounting_entries__vouchernumber

accounting_entries__departmentaldistribution

all these were added