PLA-332 add AbTest.js to Search
PLA-332 preserve ABTest.* parameters in search
PLA-334 introduce scheme for injecting query fieds (and whatever else) using plugin test profiles
PLA-334 fixed broken unit tests -- now to write new ones
PLA-334 added some tests for test group stuff
PLA-334 added test for bas profile
paid off some technical debt w.r.t. config unit testing
Merge branch 'PLA-332-passing-AB-group-to-backend' into PLA-334
PLA-133 adding use of abtest group to search
PLA-133 adding to simple test for check
Merge branch 'PLA-334' into dev