remove_annotation_filters happens before the query is built, so that the removal is reflected
  in the current query
modified to always return at least one annotation_filter, which javascript can clone
placed annotation_filters in separate div and fieldset with class and id for easy
 javascript manipulation
add_new_annotation link is overridden by javascript to clone the last fieldset,
  and update the relevant input/select ids and names, and val.  Users
  with javascript can now add multiple annotation fields before filtering
ALL TESTS PASS