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.
This instance will be upgraded to Heptapod 1.3.1 (GitLab 16.9.3) on 2023-03-28 at 17:00 UTC+1
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.