New: Pick-up list and Drop-down list for production locations

A Pick-up list and a Drop-down list have been added to the Stock list for the benefit of production locations. The Pick-up list is intended to move semi-finished products in progress to the next operation (the status 'Has been deposited'), or an intermediate location (status 'Neutral'), as soon as quantities have been reported as ready for an operation. The Drop-down List is intended to move production locations that are required for a subsequent operation.