Merge remote-tracking branch 'origin/bump-requirements' into 334-update-automatic-visit-subject-importer

Resolve "sensitive configuration options should be only write only"

Closes #359

See merge request NCER-PD/scheduling-system!280

Merge remote-tracking branch 'origin/master' into 359-sensitive-configuration-options-should-be-only-write-only

next of keen renamed

Closes #362

See merge request NCER-PD/scheduling-system!283

Resolve "error after migration to python3.6"

Closes #361

See merge request NCER-PD/scheduling-system!284

Merge remote-tracking branch 'origin/bump-requirements' into 334-update-automatic-visit-subject-importer

Resolve "privacy notice and usage terms"

Closes #329

See merge request NCER-PD/scheduling-system!276

added middleware to redirect the user to a confirmation page whenever a study has a privacy_notice assigned, this is enforced and the user haven't accepted yet. superusers excluded