Allow reviewers to attach files to each comment
Add attachment form tests; update other reviewer tests to include management form data
Changes suggested in review.
Correct inclusion of fakefilefield.js to ensure inclusion anywhere devreg/init.js is included.
Use full list of forms, rather than initial_forms, in attachment formset.
This ensures that there is always a minimum of one form (because of extra=1) and that if there is an error on submission, attachment descriptions are preserved.