V0.3.96: allow to omit send of member change notifications M docs/img/announcement_edit_form.png M docs/img/message_edit_form.png M docs/member_manual.rst M docs/programmer_manual.rst M kairos/__init__.py M kairos/utils.py M kairos/views.py M mbr_announcements/templates/memberannouncement_plugin.html M mbr_announcements/views.py M mbr_meeting_plugin/views.py M mbr_messages/templates/mbr_messages/membermessage_edit.html M mbr_messages/views.py M tests/test_kairos.py