Revert "support of RRULE in calendar app" Reverting as per Georg's request (not stable enough yet)
Revert "support of RRULE in calendar app"
Reverting as per Georg's request (not stable enough yet)

This reverts commit 55ab68a3326f6900faac3bf1779346013e6bac9a.

jbicha/server,sharidas/core,owncloud/core,andreas-p/nextcloud-server,IljaN/core,pollopolea/core,pollopolea/core,bluelml/core,pixelipo/server,andreas-p/nextcloud-server,pixelipo/server,Ardinis/server,whitekiba/server,pmattern/server,bluelml/core,whitekiba/server,cernbox/core,endsguy/server,bluelml/core,pmattern/server,sharidas/core,whitekiba/server,jbicha/server,sharidas/core,lrytz/core,endsguy/server,lrytz/core,IljaN/core,pixelipo/server,Ardinis/server,pollopolea/core,phil-davis/core,nextcloud/server,Ardinis/server,andreas-p/nextcloud-server,michaelletzgus/nextcloud-server,owncloud/core,owncloud/core,andreas-p/nextcloud-server,cernbox/core,endsguy/server,xx621998xx/server,endsguy/server,pollopolea/core,pollopolea/core,michaelletzgus/nextcloud-server,xx621998xx/server,jbicha/server,bluelml/core,pixelipo/server,endsguy/server,Ardinis/server,Ardinis/server,sharidas/core,sharidas/core,pmattern/server,whitekiba/server,cernbox/core,andreas-p/nextcloud-server,jbicha/server,lrytz/core,jbicha/server,pixelipo/server,cernbox/core,xx621998xx/server,pmattern/server,owncloud/core,owncloud/core,michaelletzgus/nextcloud-server,michaelletzgus/nextcloud-server,nextcloud/server,lrytz/core,IljaN/core,IljaN/core,IljaN/core,whitekiba/server,cernbox/core,bluelml/core,nextcloud/server,xx621998xx/server,xx621998xx/server,lrytz/core,nextcloud/server,pmattern/server