facturation: Change how invoicings and invoices are numbered.
facturation: Change how invoicings and invoices are numbered.

    * Invoicings for the CMPP must start with an offset depending
      on the last invoicing at software switching.

      INVOICING_OFFSET is used for this purpose.

    * Invoices must start with the invoicing number. We allow 99999
      invoices per invoicing.

      eg. invoicing number 133, invoices from 13300001 to 13399999.

ZTH1970/alcide,ZTH1970/alcide,ZTH1970/alcide,ZTH1970/alcide,ZTH1970/alcide