refactor: /checkins#index handler
refactor: /checkins#show handler
refactor: /checkins#new
refactor: /checkins#edit
refactor: /checkins#create
refactor: /checkins#update
refactor: /checkins reports - setting the report year
refactor: /checkins load report rows for annual report
refactor: /checkins count checkins in report
refactor: /checkins - daily, monthly, annual reports
refactor: Reportable owns set_report_(year|month|day)
refactor: /checkins#selfcheck_post