refine registration procedure

create the person info and add the user to the groups he/she belongs
Merge branch 'master' into fs_dev

Conflicts:
	openordini/oo_users/forms.py
	openordini/oo_users/regbackend.py
	openordini/openordini/settings.py
	openordini/templates/registration/registration_form.html
fix registration and replace django-cas with django-cas-ng
fix payment logic
Merge branch 'master' into fs-dev

Conflicts:
	openordini/oo_users/views.py
sketch admin for managing subscriptions
Merge branch 'fs-dev' of github.com:idlweb/openordini into fs-dev

Conflicts:
	openordini/oo_users/forms.py
	openordini/oo_users/locale/it/LC_MESSAGES/django.mo
	openordini/oo_users/locale/it/LC_MESSAGES/django.po
	openordini/oo_users/models.py
	openordini/oo_users/regbackend.py
	openordini/openordini/settings.py
	openordini/openordini/urls.py
	openordini/templates/profiles/profile_detail.html
	openordini/templates/registration/registration_form.html
	requirements.txt