Hotfix: lowercase search in ES
LILY-498: Fix case pk sometimes being null
Fixed migration for adding send_from to EmailOutboxMessage
LILY-372: Make it possible to delete email templates
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
1.5/2 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
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 'release/0.2.29'
Hotfix: memory friendly migration
Merge branch 'hotfix/0.2.29.1'
Merge branch 'hotfix/0.2.29.1' into develop

Conflicts:
	lily/messaging/email/migrations/0024_email_address_header_update_extra_fields.py
Speedup migration
More speedup for migration
Separate users from contacts and accounts