Hotfix: lowercase search in ES
LILY-499: Extend the search api for extended Contact search
LILY-494: Better select2 behavior on accounts & contacts
LILY-497: added & changed buttons
1/2 LILY-500: Prepare the search api for contact list view
1/2 Merge branch 'feature/500-contact-list-es' into develop
1.5/2 LILY-500: Extend the search api for extended Contact search
1.6/2 LILY-500: dont store empty arrays for Contact search api
LILY-483: improve Dataprovider lookup
Merge branch 'feature/483-dataprovider-update' into develop
1.7/2 LILY-500: prepare Contact search API, use lambda signals, fix Account, fix m2m
LILY-443: speedup of historylist by adding more fields to emailaddressheader
Merge branch 'feature/speedup-historylist-emails' into develop
LILY-498: Fix case pk sometimes being null