Basic pagination
Paginate participants in Org connexion
Use explicit URL in filter and pagination forms
Add styling for debugging and technical info
fix the formula for per_page
Assign a variables for filtered participants

Keep all filtered participants in `@filtered_participants` variable.
Show participant count and SQL on the index page
Add a workaround for the ActiveRecord count bug

See https://github.com/rails/rails/issues/9458 for details.
Improve form input fields