Issues/1475: Ensure we have pagination

[CloCkWeRX]

Fixes #1475

Survey of code base:

• app/controllers/garden_types_controller.rb
• app/controllers/scientific_names_controller.rb
• app/controllers/admin/members_controller.rb
• app/controllers/admin/roles_controller.rb
• app/controllers/admin_controller.rb
• app/controllers/plant_parts_controller.rb
• app/controllers/alternate_names_controller.rb
• app/controllers/forums_controller.rb
• Fix tests :(

[cesy]

Yes, this helps

[cesy]

Oops, we've got some test failures, though

Missed a bit

[CloCkWeRX]

Oh. The failures are from a stub being passed in, with an array, where the actual code/pagination code is an ActiveRecord::Collection / similar.