Don't interrupt update_language_packs -- simply report error
Make KA topic tree work for updates dynatree
Made search tree co-exist for multiple languages in server-side memory and client-side local-store; works! See cleanup issue #1223
Made search page work as well
Bug in logic to get_or_create that caused uniqueness constraint to fail.
Merge branch 'release-0.11.1' of github.com:learningequality/ka-lite into 1067
Merge branch '1067' of github.com:aronasorman/ka-lite into 1067