Sam: Back logic. Refactored booleans to be booleans everywhere rather than strings.
Sam: Some more tests
Sam: Unwiped feature tests for back button and merge them.
Sam: Edge case logic. Entering a section from afterwards.
Sam&Michal: changes after code review
Merge branch 'master' into back-logic

Conflicts:
	rps/beta_claim_forms/form_config.py
	rps/beta_claim_forms/routes.py
Merge pull request #184 from InsolvencyService/back-logic

Back logic