:date: 2019-01-05

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Saturday, January 5, 2019
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I maybe found a solution for an intuitivity problem : the :meth:`__str__` of
Enrolment now just says the two id numbers (partner / course reference or id),
and EnrolmentsByClient and EnrolmentsByCourse now use the detail_link.

The possibility to add an unspecific partner by clicking at the magnifying glass of the TwinComboBox of the
`lino_xl.lib.courses.Course.enrolment` field.

:mod:`lino.mixins.polymorphic` : the MTI navigator now removes MTI parents without detail view.
:class:`lino_xl.lib.contacts.Partners` no longer has a detail view.

:mod:`lino_xl.lib.tim2lino.spzloader2` now creates the course lines so that
"individual therapies" is the first one.  That's important because the first
course line is used as the default when creating an enrolment without
specifying course.

The invoiceable_fee virtual field didn't yet work (it was a displayfield, must
be a readonly fk field).

Die Buttons und Hilfetexte des Fakturationsplans waren noch in der falschen
Reihenfolge, hatten englische oder unklare Hilfetexte.  Der Button "Rechnungen
erstellen" war unsinnigerweise auch im Toolbar des Fakturationsplans.