Store phonenumbers somewhere

[hmpf]

Part of #97.

[codecov-commenter]

Codecov Report

Merging #102 into master will increase coverage by 0.88%.
The diff coverage is 91.42%.

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
+ Coverage   73.08%   73.96%   +0.88%     
==========================================
  Files          32       34       +2     
  Lines        1211     1260      +49     
==========================================
+ Hits          885      932      +47     
- Misses        326      328       +2     

Impacted Files	Coverage Δ
src/argus/auth/models.py	83.33% <77.77%> (-16.67%)	⬇️
src/argus/auth/views.py	83.33% <90.90%> (+11.90%)	⬆️
src/argus/auth/admin.py	100.00% <100.00%> (ø)
src/argus/auth/serializers.py	100.00% <100.00%> (ø)
src/argus/auth/urls.py	100.00% <100.00%> (ø)
src/argus/ws/__init__.py	100.00% <0.00%> (ø)
src/argus/ws/models.py	100.00% <0.00%> (ø)
src/argus/incident/fields.py	89.47% <0.00%> (+2.63%)	⬆️

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[hmpf]

I've squashed some things and force pushed. New stuff: checking for ownership in the viewset.

[ddabble]

I think it might be better in our case if we defined this method instead of queryset:

def get_queryset(self):
    return self.request.user.phone_numbers.all()

In that case, we might as well remove the IsOwner permission, but on the other hand, it could be nice to keep it to be explicit. Any thoughts?

[hmpf]

I think we need to manually test :)

[hmpf]

I've force-pushed a fix for this, after testing. I've also rebased on the drf-permissions merge-point.