User availability
For now, the model is not exact (boolean field).
In DjangoLDP Profile I will have to change the model to something like this:
DELICIOUS_CHOICES = ['1', '2', '3', null]
iLike = CharField(choices=DELICIOUS_CHOICES, default=null)
Then I will have to adapt the html and css of member-profile in sib-directory to fit the choice (link each number to a status and a SVG) and in page-user-profile in sib-app (widget + style).