Make helper specs pass again

There are some quite horrible things here, but at the moment I'm just
trying to get all the specs passing again. When I get onto the features
I'll have more of an idea about which helpers we actually need, and
will revisit this to make the helpers better.
Make the mapping index feature pass again

Also update two fixture steps which are also used in other features.
Make mapping filter feature pass again

Also update a fixture step which is used in several other features.
Make the mapping edit feature pass again

The specs for the ToggleMappingFormFields js module were not being
run because the filename didn't end 'spec.js', and after renaming
the file I found that 4 of those tests were failing (on master as
well as on this branch). I've updated the tests so that they look
ore up-to-date, but they are still failing and the output from
rake jasmine:ci isn't very helpful.
Make mapping_create_multiple feature pass again

And also hits_all as a side-effect.
Make mapping_edit_multiple feature pass again

All features and specs are now passing, and the only remaining
failing test is the javascript one which was already broken.