LB-545: Embed URL crashes if a user who has published posts is deleted
* some initial overwriting
Merge branch 'devel' into lb-545-user-retirement
LB-545: Embed URL crashes if a user who has published posts is deleted
* adjusting
LB-545: Embed URL crashes if a user who has published posts is deleted
* deletion set as inactivation
LB-545: Embed URL crashes if a user who has published posts is deleted
* adjusted
Merge branch 'liveblog-15' into lb-545-user-retirement
LB-545: Embed URL crashes if a user who has published posts is deleted
* adjusted
LB-545: Embed URL crashes if a user who has published posts is deleted
* adjusted the upgrade script
Merge pull request #250 from msat-cont/lb-545-user-retirement

LB-545: Embed URL crashes if a user who has published posts is deleted