Add confirmation functionality

pi/decorators.py

pi/migrations/0008_alter_pi_status.py

pi/tests.py

pi/urls.py

pi/utils.py

pi/views.py

proceeding/decorators.py

proceeding/forms.py

proceeding/tests.py

proceeding/utils.py

proceeding/views.py

sonar-project.properties

templates/confirmPi.html

templates/detailPi.html

templates/detailProceeding.html