Fix typo in test description
Re-implement autosuggest for group wp-admin.

First pass. Suggestions API still needs updates to make this work as
expected.
API tweaks to fix group wp-admin suggestions.
Minor whitespace tweaks
Tests for group wp-admin auto-suggest
Remove debug
Suggestions tests: sync group members to non-auth tests
Suggestions tests: count() can lie

count() on a WP_Error object can return 1. This is making some tests
pass accidentally. Check `is_wp_error` for each test just to be very
sure we don’t let anything similar through in future.
Remove copypasta from 0846535
More copypasta
Suggestions: grp members exclude test for non-auth