Cleaner use of Group in kfet app

KFetGroup model

• Provides a distinction from non-kfet Groups.
• Convert code appropriately.
• Initially filled from Groups containing K-Fêt (this was the previous distinction) in the kfetauth.0002 migration.

Permission proxy model (kfetauth app)

• Proxy of the django.contrib.auth Permission model.
• Adds the 'kfet' manager which returns only kfet-related permissions.

KeepUnselectableModelFormMixin

• Helps to keep the unselectable items of many-to-many field for ModelForm.
• 'kfetauth' forms (related to KFetGroup) use this mixin.

Using KFetGroup allows to simplify the 'kfet/account_group_form.html' template.

A bug is also fixed in 'kfet/form_field_snippet.html', which could lead to prevent field displays if they used CheckboxSelectMultiple widget.

added 1 commit

• 4ee9d626 - Cleaner use of Group in kfet app

Compare with previous version

added 1 commit

• ded824bd - Cleaner use of Group in kfet app

Compare with previous version

added 1 commit

• a78b939a - Add test for callable queryset with Unselectable…

Compare with previous version

added 1 commit

• 8ea5775d - Add test for callable queryset with Unselectable…

Compare with previous version

resolved all discussions

resolved all discussions

added 15 commits

• 8ea5775d...3b1d8487 - 14 commits from branch aureplop/kfet-auth
• 085a0680 - Merge branch 'aureplop/kfet-auth' into aureplop/kfet-auth_perms

Compare with previous version

merged

mentioned in commit c17ed416