Adding father_alive field to importer and fixtures

Jira story: https://osraav.atlassian.net/browse/OSRA-221

Jira tasks:
OSRA-224#Code-Review
OSRA-226#Code-Review

- Added father_alive to pending_orphan model
- Added father_alive column to importer yaml settings
- Updated fixture files to new format
- Temporarily disabled father_date_of_death validation
I'm not very comfortable with this because while the validation is turned off, we need to be careful not to create bad records on develop, and to be doubly careful not to push the code up to staging and beyond. Can the proper validator not be included in this PR?