LILY-180: tags are not required per default
LILY-182: give reply_to default value of None so we don't get errors
Added DatePicker widget for Deal forms.
Removed some mwsadmin-era plugin references from Deal forms.
Fixed javascript error for Select2 initialization for empty tag-fields.
Fixed css full-(container)-width rendering for Select2 fields.
Restored previous-themed error pages until they're replaced.
Merge branch 'feature/theme-metronic' into develop
Restore mail_admins logging handler
LILY-185: email messages not showing in history lists
Merge branch 'feature/theme-metronic' into develop
LILY-184: Fix errors in EmailMessageComposeBaseView because it retrieved email addresses from multiple tenants.
Restore save handler for email configuration wizard
Update static files to include proper datepicker static files
Merge branch 'feature/theme-metronic' into develop
Merge branch 'develop'

Conflicts:
	_generated_media_names.py