Add date and age to dunning
From https://discuss.tryton.org/t/send-an-email-automatically-passed-some-days-after-processing-the-dunning/4591 it may be useful to know the age of a dunning.
From https://discuss.tryton.org/t/send-an-email-automatically-passed-some-days-after-processing-the-dunning/4591 it may be useful to know the age of a dunning.