WIP: Administratietrucjes: Announce direct debit notification

Ghost Userrequested to merge
103-1-email-direct-debit into master

Checks #103 (closed) sub 1

Short description

Add the ability to send emails to members to announce the direct debit.

Steps to use this feature

  1. Execute ./manage.py senddirectdebitnotification
Edited by Ghost User

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